I pictured an art nouveau style poster from your sketch! Since its a dancing event, I think you could add more gesture into the people's poses. Right now its a little hard to tell its swing dancing because their poses are a bit stiff. Maybe try poses that show off more of that swing energy (example, one of her arms may be up in the air, head thrown back a bit, or her legs swing up, etc.) I would google some swing dancing pictures as reference for your poses. . If you dont want to change the people then maybe use more curvy wild vines to give the piece some movement. Good luck!

Love those wolf designs. Your revision of Red also looks great, I think the hair really made the difference in that design, she looks more like a little kid in that sense. Great work.

This is a character concept sketch, I think I'm gonna use it for a comic book project