My nine year old is loving to draw and showing some passable skill for his age. I want to continue to encourage him myself, but am also looking for a decent book that he can work through to hlep him advance his skills beyond what he does now. He loves to read and self-learn.
That said, I am looking for something more advanced than some of the kid art activity books you can normally find (i.e., "if you can draw an "H" and a circle and some triangles, you can draw a lion!") and the more advanced stuff you might give a late teen.
He's smart for his age so I'd rather err on the older side if need be. But something that isn't going to put him off and looks too complex.
So I appeal to folks here ... what book(s) would you recommend?