that cosplay improvement panel sounds really good actually, i just wish someone could, cuz i'm barely learning >.< i could do maybe a cosplay do and do not kind of thing, like "don't make the cosplay look too much like how it does in the anime/manga, aiming towards a more realistic feel helps it look more natural and not too cartoony" or "if you want to go for the cartoony look, try to add maybe less details, and more cartoony colors" "try to not cut your costume too short before making it or you end up with something too small, and if something happens you can't make it bigger" or "if you have a wig, don't try to cut it too short, cuz sometimes leaving it a bit longer than it should be, it looks really nice and it gives it a more natural look on you" or "add a little bit of ___ or add more/less accessories, etc maybe add a prop to go with your costume to help ppl identify you, if necessary"
and i did like when one girl came up to me and asked me how i sewed my gumi cosplay together, and even i critiqued myself and gave her some pointers on it, but since i got bits and pieces from clothing and put it together, i couldn't give her any "how to make it from scratch" hints >.<