Okay i need opinions!

My boyfriends birthday is coming up. I recently posted the picture of just iron man but decided to add more to it. He loves Marvel and so I was thinking I could make him a shirt with this design on it?? Or maybe stick with the phone case...? Is it good???? I paint watercolors (usually just flowers, so this is different for me).

Not sure if I should put this on a plain shirt for him, put it in his card or put it on a phone case??

Anyone?