Do whatever most inspires you -- I happen to think the long split skirt singularly kicks ass, but then again you've already put oodles and oodles of work into the short-skirt sprite sheet. I've done only two sprite sheet edits in my whole lifetime, and those took me several days each (but neither had the sheer number of frames that a Chrono Trigger sprite sheet has), so I can definitely appreciate how much you've already put into the currently-existing design.
