*This tutorial assumes a basic knowledge of Adobe Photoshop and Illustrator.
1. I'll start in Photoshop, with a U.S. letter page in landscape layout, saved as "lionthorn.psd" to a well-named folder that I can always find. First I need the background of sky and ground/folliage. I always photograph the stages of paintings that I work on in the real world (ie, not digitally), when I see landscapes, skyscapes or other natural forms start to emmerge, and save them in a file to use for this very purpose. So, I'll open two of those that I think will be good to work with, rotate and crop to the sections I want, then copy & paste them into my .psd document and re-name their layers "sky" and "ground":
2. I'll work on the sky first, so let's turn off the visability for the ground layer. Most of this sky will need to look abstract, like clouds in a sunset, but I want to save this butterfly shape to keep in focus for later. Select the butterfly with the Pen tool, convert the path to a selection in the Paths pallet, then cut and paste it onto another layer, by selecting Layer, New, Layer Via Cut from the Menu bar. Name that layer "butterfly" and turn off its visability.
3. Next, we'll work on the ground and foliage. Make the ground layer visible, and unlock it. First, we'll remove the hard edges and the bright blue areas to give us forms that look more like folliage, dirt and rocks. Drag down a horizontal guide from the rulers, just to keep an idea of where the horizon should be. Select the Eraser tool, set to Brush mode, with a relatively hard edge, and begin erasing the "ground" layer. Continually change brush size for variety around what might be leaf and rock edges.
I want to leave some of the blue areas, for shadow, but I need them to be more of a green hue, so as to resemble shrubbery. I'll add an Adjustment layer, Hue/Saturation, and bring the hue slider down to the greens, the saturation up a bit, and I'll darken the tone, by bringing the lightness slider down. Now, the whole image has been adjusted, and I just want the "folliage" changed, so I'll make use of the Adjustment layer mask. Click on the mask icon to select it, and select Edit, Fill from the Menu bar, choosing Black from the dropdown menu. Click OK. The Hue/Saturation adjustments I made before have all been masked out. Now, I'll paint with with white in the mask, to bring those adjustments back where I want them only. It's easiest to first select the ground structure, to isolate your painting within the ground, without the white brush bleeding out into the sky.
4. To get a more dimensional space for the lion to sit in, I'll need a floor and some extra rocks and plant forms. I get can make all of those straight from the painted folliage I already have here. First, for the floor, I will add a new layer, name it "floor" and use the Clone tool to create a structure, sampling from the "ground" layer, by making sure the "sample from all layers" option is cllicked in the Control panel. Before building, first use the rectangle Marquee tool to isolate a stage for which to hold the floor. Use the Clone tool with a medium sized, soft brush to randomly select your source (alt+click) and paint floor, clicking to select and then to paint with as much variety and randomness as possible, to get a naturalistic jungle floor. With all other layers invisable except "floor" and "sky":
5. For the extra plant and rock forms, we will sample again from the "ground" layer with the Clone tool. This time, pick several interesting paint brushes for variety, and artful-looking strokes. I used mostly the round angle and the round blunt, but go by your instincts. Remember that this is a children's illustration, not a photorealistic postcard, so have fun and be creative. It's easiest to turn off the visabilty for other layers, and just set these plant and rock form far apart and on several different layers, for selecting and modifying later.
7. Now that we have all the pieces and parts, it will take an artful eye and some common sense to make the image look like a more natural, deep space. For example, the light on the lion is coming from the opposite side of the sky, so I'll select the "sky" layer and choose Edit, Transform, Flip Horizontal to change that. Adding shading where needed, like under the lion's paws and stomach, and over the background floor space, will be easy, since I've kept everything on separate layers. I used the Paintbrush, experimenting with shades of extant colors, a blending mode of either Darken or Multiply, with a low opacity to add shadows. Vary the brush size and softness/hardness to imply different surfaces of the rocks and plants in the background. For example, the overhanging ground forms behind the lion would be blurrier and less vibrant than the foreground forms. With all layers turned on, you should be able to see what looks strange and needs tweaking, so use your best judgement.
8. Remember the butterfly? It will be the perfect addition to the now rather empty cloudy area to the upper left, after the Flip Horizontal command. Turn the butterfly layer visability back on, and use Ctrl+T to rotate, shrink and move the butterfly so that it flutters just above the lion's head. Use Edit, Transform, Skew to reshape the wings.
9. This image will be set within a portrait layout page, and since this is a landscape layout, I will add a border and some flourishes above and below the image in Illustrator. Open a new Illustrator document, set for Print, U.S. letter, and change the artboard option to 2. Select File, Paste to put the lion image on artboard 1.
10. Some thorny flourishes would be perfect, so I'll Google "throny roses" to find a starting place, and paste that .jpeg onto artboard 2. I've found a tatoo tracery that I would like to change (I want more thorns and I don't want roses), so I'll turn this bitmap into a vector by selecting it and pressing the "Live Trace" button in the Control panel. The black and white default is perfect for what I need, so I don't need to change any trace options. Press the "Expand" button, and then choose Object, Ungroup from the Menu bar.
Some of the rose parts need to be separated first, and the easiest way is to use the Eraser tool to just erase right through the connection. Illustrator joins the open points automatically to close your shape back together. Nice of them, huh?
Now I can alter the shapes to my heart's content by using the Pen tool, and it's add point, subtract point and convert point sub-tools. I can pull out points to turn into thorns with the Arrow tool, and break smooth curves into corners by holding down Alt before clicking on a handle. If you haven't had much experience with the Pen tool, what are you waiting for??? It's the most powerful tool in the whole program to customize shapes!
11. After I've made a couple thorny embellishments, I can copy and paste them onto artboard 1, where I can multiply them, arrange them, rotate, and resize them, reflect them (Reflect tool) to make my flourishes. Turn on guides (View, Guides or Grid), or make your own (View, Rulers, then pull down guides from the rulers), to line everything up perfectly. Add a border around the image by drawing a black box with the rectangle Shape tool on a layer below, and another box with an empty fill and a thin black border on a layer under that.
Turn off your guides, and voila! Fin!