Personally I've haven't seen evidence of what you've posted like closet cosplays, but then I haven't been lurking around Cosmode for a long time - I have seen some rule-breakers like there being two people in the photo when it's only supposed to be an individual.
But the only thing you can do is just keep posting images, they have to deal with so many, but I'm sure you'll get in at one point c:
Sera Myu Eternal Sailor Moon - Sera Myu Musicals - 95%
Mew Berry (Café version) - Tokyo Mew Mew Á la Mode
Usagi Tsukino (School Uniform) - Sailor Moon
Sailor Cosmos - Sailor Moon Sailor Stars
Bubbles - Powerpuff Girls Z