Well, you have fantasy-style dress here, so you might use a fantasy-style backdrop, a large rising moon, an exotic other-world scene, a medicine wagon, a dragon looking over their shoulders, etc. Your photo, your imagination.
Thanks, Tim. That satisfies my intellectual curiosity, sans intelligence of any kind. Lol.
But you know what? These are some pretty cool characters and you photographed them perfectly. I think Treepusher has a point; a more poignant background is order. What that would be, I haven't a clue. This is starting to remind me of an old Fleetwood Mac album cover. Lol.
Your shot and its sky treatment are really nice. How about a Sepia look layered over a Victorian railway platform or a fanciful hot air balloon in the background.