Superhero Birthday Pages

I really want to begin making items to sell on Teachers Pay Teachers, but really do not know where to begin.  I created this Superhero Birthday Set for a friend.  I think it turned out pretty good for my 1st try.  Would love some opinions before I post it on TPT.

This is the 1st page of what I created.  I will post more after I get all the permissions I need to get.  Thank you!