Hey great imagination and concepts!
My only complaint is not seeing much anatomy studies/gestures - most of these concepts, the characters look off, a little disconnected at joints, or too big/small areas concerning perspective! Yes I am tooting a horn I should also be listening to, haha, but just sayin'. Get a more natural feel for gesture and anatomy and you will be a even more great at what you're doing ~!
ps. can we see more color/brush?
ok ok I'm done! /runs