Dear The Fun Pimps, please stop shoveling your AI art into this game and the steam update icons. We can all see it. It doesn't hold up to scrutiny. You look cheap and stupid.
I'm with ZZTong on this. I don't see anything that suggests this is AI. Assuming everything is AI doesn't make everything AI.
First, the chicken...
That is a chicken that has the left left kicking outward with a twist of the hips, leaving the right leg bent underneath. You can see the left arm. The other arm isn't shown beyond the shoulder and perhaps a bit in shadow. Proportions are fine. They fit the perspective of a leg coming at you in a cartoon-style image. So the chicken looks fine and not at all AI.
Next, the zombie....
Not sure why you are upset about the pupils here. To me, it looks like one blind eye. Looks fine and not at all AI. The mouth looks like the zombie was just hit and is in the middle of an action scene of the face swinging to the side/around with the jaw pushed towards the side from the kick. A second or two later and the face would be back to normal as the action continued. It is completely normal to have mid-action images in animation that show an action that isn't fully complete yet to indicate that action happened. Again, this isn't AI.
Blood...
The blood indicates motion... the motion of the zombie head swinging around from being kicked. It shows the rotation of the head and the blood spraying outward as the head whips around. Completely expected and normal for such a scene. Not AI.
Tree...
What's wrong with it? Just because there's a gap below it? That tree could be on a hill or mountain and higher up, so a gap makes sense. Or, it could just be background and it's not at all uncommon to draw background in rough strokes that leave gaps and stuff like that simply because it's background. Nothing at all unusual about that. People draw trees without the bottom part of the trunk quite often. And even if this was an AI image, that wouldn't be a reason to think it was.
"Nonsense"....
You'll need to be more clear. What's nonsense about those two areas? I see powerlines and a power pole. I see darkness on a mountain. And even if you think those parts look like "nonsense," what makes you think those look like AI? AI errors are pretty consistent. And those don't suggest AI at all to me.
Conclusion:
I see nothing that suggests this is an AI image. Maybe it is, maybe it isn't, but nothing you show looks at all wrong to me. It looks like a normal art style and something I've seen many times over decades (long before AI was a thing).