This is awesome. I have recently gotten into the steampunk story, and I've decided I'd like to write a novel series set in it. The woman in the green dress is great inspiration for what I want one of my characters to look like)
I love how you captured the steam punk style with a limited colour palette and really charming designs. I would suggest that you take a look at the top middle girl. Something about her breasts seem off. It looks like it would be incredibly painful for a bra to constrict her like that. Apart from that, I like the costume choices you've made. They're all very elegant.