have to help him internalize by saying you should be proud of yourself for what you have done.
need to be specific in my praise
should reinforce effort, not necessarily the end result.
should ask questions about how and why he did what he did and have him explain his thought processes as best as he can
should interest and reinforce the actions he does
need to give direct praise of the effort used to complete the artwork, or the new activity, not over praise the outcome.
need to say I love you a lot