Hey Camille!
I'm not going to back pack onto what Kigerneko said rather lets speak about character designs and shape language shall we?
Shape Language
- Shape language in objects like Mech type builds or anything geometric heavy is naturally going to be very important yes? An great idea when making designs for mechs and creating various shape designs is doing black and white silhouettes to get an idea for cool concepts for your characters and what not. Here's an example.
There's an image from someone I know who created 3 characters but mulled through many designs to create them. Character design isn't a way way ticket, your first idea often times wont be the best. I recommend looking at other works that inspire you and see what you can take from them and add to your piece. Sketch up various designs, think about what you make read better. Look how flat the feet are for instance. If you look up medieval sabaton's you can get a better idea for cooler shapes for the feet.
There's much more I can tell you but for now I'll leave it at that. I wish you the best of luck camille, may of paths cross once more.
Exofley
Signing out.