¿should we create big size monsters or stronger stat monsters?.

As seen on images, size need to be bigger to can add more details on draw. Also I add the old centaur sketch to compare size and details. About weapon system, I take some ideas from "Satyr king" character from Demigod forums, where a possible character storyline and attributes are described too.

Im thinking that draw "2 legs things" as a minotaur can be more easy than draw a "4 legs thing" like a centaur, I'm thinking on redraw centaur, and doing a minotaur I will get more experience with big shapes.
Also I have a question:
¿Can 3D models from other games be adapted on 2D pixel games even with copyright on it?
mmm... ¿Did all gods and mythology have copyright owner?. If that kind of "3D to 2D" adaptation is possible, I see good references on action/rpg games like GOW.