I bought The Dot by Peter H. Reynolds recently and thought it was wonderful. It's about a young girl who doesn't think she can draw, but who has an amazing art teacher who encourages her.
Maia enjoys The Dot and wants to read it several times in a sitting, but the book is really aimed at older kids and even adults. Maia, of course, hasn't gotten to the stage where she might question her drawing ability and I hope that she never does.
I worried a little (as I worry about everything!) that by reading her a book about a child who doesn't think she can draw that I might be introducing the concept to her. But in the end I decided that the book is really about a girl who grows tremendously in creativity and confidence and who goes on to draw and paint enough for a whole art show.
And really, I shouldn't worry so much!