The modeling is competent enough. A couple of points look glaringly “off”, but that’s not the big issue, imo. It’s the posing that’s really letting these figures down. Take a look at that topmost Hulk/Deadpool image. There’s no forward momentum. There’s no story really being told. There’s no energy. No pop.
Hulk is practically motionless. Deadpool looks like he’s searching for a dropped wallet. You need to pay attention to your lines of action, your focal points, and the story you want to tell.
Hulk really needs to be leaning forward, maybe arms back some, as if he’s rushing Deadpool like a bull. Push those facial expressions more. ANGRY!!! ENRAGED!!! SMASH!!! Deadpool needs to be focusing on what he’s doing. Right now, he’s not. His head’s titled down. His left gun is lazily pointing to shoot Hulk in the foot. His pose isn’t dynamic enough. Whip out some of the wire-fu movies to research some outrageous action poses.
Right now, I’m feeling like you’ve posed some action figures instead of actually staging a scene. Also, I’m getting the impression that you’re relying too heavily on specific camera angles for your posing/referencing. Deadpool & Hulk might look okayish from one angle, but totally off base in other angles. You need to find a happy middle ground for all of your viewing angles. Otherwise, that’s like modeling a head from the front view only. You neglect the nuances of the other views and don’t compensate for the change in camera position.