Novel Illustrations

I think I may be finished with the latest round of revisions to my middle grade novel manuscript.  Before I start querying, I want to have a few sample illustrations--two or three black and white interior illustrations and a color cover piece--to accompany the package.  That's what I'm working on now.  The following sketch is from the opening scene:

My original thinking was to work up a final version in pen-and-ink with a tonal wash. To that end, I inked what was essentially the same base drawing (without shading) that you see above.  The result was such a disappointment that I'm not going to post it.  Part of the problem is that I drew it too small to get a real handle on the facial expressions.  Also, the characters, who are supposed to about twelve years old, looked too young.  Today I've been redrawing the same picture at a larger scale while aging up features slightly.

You will notice that I haven't done any inking or shading at this point.  As I was drawing this I started thinking of other possible ways of completing the image.  I have Adobe Creative Suite 5.5.  I have the day off from my day job tomorrow.  Maybe I'll see if I can work this into a strong image in the forgiving layers of Photoshop.