Flame Princess steampunk design is one of my favorites. It's just so detailed. Actually... Both hers and Flame Prince's design fit them SO WELL.
Here're the references.
That backpack. Or whatever you call that thing on their back.
Here're the others!
Textures are from pixiv and by ~LastAutumnShade
, the flame brushes are by ~SugarBreezy
, and the border is by *Beinspyred