Heat accelerates decomposition. Cold burns tissues. Water logfing from rain would be a nuisance, at least.
I think most “undead” type zombies handwave that sort of stuff away as part of the powers that animate them in the first place. It’s only really an issue for “virus” type zombies.
AI seems to really love that extreme high contrast side-lighting on everything. Then the text itself is irregular in a very non-human kind of way, like there’s no natural processes that would result in an ‘E’ like the one in ‘BECAUSE’.
Then you’ve got the person’s face, which if it were drawn by an artist of the skill level we’d expect from the rest of the piece, one would imagine they’d do a better job of conveying some sort of personality or emotion.
AI Art is fundamentally antisocial because it’s the Art equivalent of the Bullshit Asymmetry Principle; it took less effort for OP to create that than it did to pick apart exactly why it feels so unsatisfying and unsettling in all the wrong ways. Always downvote AI Art.