Tip number 5:
There's a difference between a Portrait, something you send to grandma with smiles, and an artist photo, which is hung in a gallery or printed in a design book.
Who says that a cosplay picture needs your face? Are you taking a photo as you the person dressed up in a costume or are you taking a photo as the character (I'm very opinionated about this subject when it comes to cosplaying). The character can be defined by their clothing, their stance, their environment.
So let's play with angles again.
By looking at the photos you immediately know who you are looking at (granted you know these characters already). But these photos give a a certain mood, a vibe. As they say "Less is More"