The way he's holding the rifle feels a little unnatural. Wouldn't you usually put your hand -under- what you're carrying? Not many people carry things by palming them from the top...
It's also a little unclear what exactly his pose is supposed to convey. Like someone else said, it kind of looks like he's getting ready to hoist a flag. If he's supposed to be stealthy, I don't think he'd hold his gun six feet over his head.

Cool work! I like all of them, except for the butcher. He's giving me strong "fake anime" vibes, like those horrible shows from the early 00's. He's well drawn, he's just giving me flashbacks to terrible things.

It's obvious you're comfortable drawing, though. All your characters are very lively and natural looking. Good work. =D

I actually liked your old color scheme. The new one is very purple! Like they're underwater, or in a dark cave.

 
Yar, I do like some of the colors, Mathias, but I think you flattened out the picture a little, which is the main reason I prefer Slym's, still. All his forms look good and chunky, even if they're not totally realistic looking, and there's a good sense of depth because of the darkness under the trees and such.
Your water does look more water-y, but I kind of love Slym's water for some reason. It feels so heavy, like I could reach in and scoop it up like jello or something. That might not have been what he was going for, so he might actually prefer your edit, but I'm digging his water, hahah! 

Also, I've never liked the fake paper textures art programs have. I don't know why! I'd probably like yours a good deal more if you removed that, heheh.
Anyway, cool edit, and good on you for even bothering to do it. Most people can't be arsed to spend so much effort trying to help other members, so thanks for being a credit to the force, hahah!