Virginia,
A wonderful portrait! I can tell you really put your heart into it!
This may just be another version of what Peggy said, but the girls right cheek looks as if she has a wad of gum or something hidden there! The photo does have a full cheek, but maybe the soft edge there makes the cheek look a little too full? Isn't it funny how those things are easy to spot on someone else's painting, but so hard to see on your own?