Yep, I want each of them to have a distinct tone without having to label what they are.
I think the style is good, though what is the pyromancer doing in the lower left picture?
Because it looks like she is scratching something on her back but her arms is like, snapped back.
It doesn't really look natural, IMO.
But yeah, i like the style and so far you did well at the distinctiveness of them.
I assume the face details come later or something?