I've felt DS9's drawing skills were above average, as it were, since he was very young. I don't recall ages any more, but I do recall that while the other kids were scribbling all over he was making careful circles, and while other kids were drawing stick figures he was drawing fairly detailed people. This past year he started drawing with perspective - very 3d. I have no idea where he picked it up, either.
I saw this linked on another board (parenting) and he's doing drawings like what's listed under age 12 -
http://www.learningdesign.com/Portfolio/DrawDev/kiddrawing.html I have no idea how accurate that chart is, btw.
