Purely because I'm getting sick of re-sorting stuff after submission, any deviation that is submitted to the wrong folder will be denied. The only exception will be an "offspring mix" picture being submitted to "featured" because, honestly, that's understandable.
Featured = pinkie pie and fluttershy together
Fanfiction = literature ONLY (or a picture with the story in the description)
Pinkie only - self explanatory
Fluttershy only - self explanatory
Offspring mix = child(ren) of pinkie and fluttershy (can include them in the picture)