I wonder what a Steampunk Cassandra Cain would look like? the oriental/ninja style steampunk era themes would be interesting... maybe taking some influence from japanese and chinese sailboats? y'know the sort of segmented batlike sails?
I love your design experiments! They always turn out so cool. I'm a sucker for steampunk, though I've never drawn any myself, now that I think about it. I like how her outfit almost looks cobbled together. And again, you pulled out a great sky with your markers.
I know you don't have a lot of free time, but if you could ever get around to it, I think Harley Quinn would go well with a steampunk "re-imagining".