Anonymous I have a picture of you as a child. Good! Anonymous I have a child picture of you.
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AnonymousI have a picture of you as a child.Good!
Anonymous I have a child picture of you.Although it probably means the same thing, a native speaker would never use this version!
AnonymousI have a child picture of you.After the pattern of 'child bride' (a bride who is a child), 'child picture' would mean a picture which is a child — clearly impossible.