Hey,
Oh yes, I really think you're right on the point, that fantasy theme suits better here.
Even my supposed "sci-fi" corner is not really one ^^' (more a mix of different eras...)
Right now I'm working on doing some different sketches for the Barbarian...and I maybe we'll stay with her (if she does not dissapoint me, of course haha).
But yes the Giantess could be nice (and others...the choice was hard to make, for sure).
I really do enjoy too the Chaos Knight and Pure Evil Child...but I can't find any good thing to do for an illustration (or not enough skilled to try out...hum...).