Firstly, the index fingers shouldn't be on the trigger unless they're currently in combat, otherwise, it should be up against the side of the trigger guard
Secondly, look up images of how people hold weapons, the stock/back of those AKs are commonly between the arm and torso
And i'm not sure what the guy with the shotgun is doing, but it's super goofy looking, it should be more like this

Also, why is there a Turtwig?