Depends on the platform, on the view (fps or tps for example), and on a few other things, but the double or the triple (or even more depending on things) of the current is really acceptable nowadays.
Thats looking good to me, its depends where you will use them on. For example: in a realistic propose will not fit, but in a stylized scene, that will fits very well :)
Everything seems half finished....You should have at least 5-6 pieces of finished pieces of art in one category, for example environments or characters.
I hate it when they dont put coop or mutliplayer in a game because a bunch of xboxliveless fanboys complain that theyll ruin the story. Example: Fallout 3
That's like saying "THIS is why I hate video games. All of it." in response to Columbine. EDIT: On second thought that's not the best example. You get the point though.
This game is a perfect example how a simple game, done properly, can be just as much fun as a game where they spend millions, and jack if full of crap.
I know. example. https://www.artstation.com/artwork/Ban2m decide yourself just your proportions look strange design is good. but you can still improve it. Good luck!