no, it would be detailed enough for a design on its own. Give it a sub of its own and see what happens. Perhaps a wrap around the side placement also as an option so the paper doll design could be bigger on the shirt.
I love it, but either it should be just the boy...or the girl should be wearing a different outfit...her outfit is awful. I could see her being a toyboy with a pink shirt and overalls maybe..that way you could still have the heart on her clothes....