It's nice to post some good photos, especially of the costume being worn, but it's not required. People like to see close-ups of the beadwork and they like to see how the costume looks on a human being.
People like to know the measurements, bra cup size, hip size, skirt length, etc.
As long as it's your personal costume and you are not a retail business, post it in the regular swap meet forum.
Welcome to bhuz!