My main beef with the artwork in 3.x isn't that there are piercings, tattoos, buckles and spikes, but that there are so many piercings, tattoos, buckles and spikes. I would be fine with this if it were more limited. For example, the gnoll in the 3.0 MM has 4 ear piercings. A gnoll has that? The magmin, athach, bugbear, centaur, dryad, efreet (but not the djinn), gnome, goblin, hobgoblin, etc have piercings. The kobold has a silly spiked ring on his tail. The locathah has a buckle that he couldn't possibly have clasped with his fin-hands. Check out the iconics and you'll see lots of piercings. My favorite though is the winter wolf with a pierced ear. Now who would do that?
As for buckles and spikes, I think it's a cool character concept, but most of the iconics must wake up at 4 in the morning just to get ready. It isn't cool if everyone's doing it. And how in the world does Hennet go to the bathroom? Not that it's safe for him to go - look at the fingernails on that guy!
The other thing I've noticed is the number of exotic weapons being wielded. Again, nothing wrong with the concept, just overused. Spiked chains, dire flails, and any other weapons that looks like it could harm the wielder more often than the target are not my cup of tea.
Not that 1e was so much better (I skipped 2e and can't comment there). I'm sure late-comers would be bored to tears seeing all the pot helms and longswords. Same issue - too much of one concept. I'd like the art to reflect my game, like all of us, but we all play different games. So I'd like to see more diverse themes in the artwork.
As for the styles, I'm pretty open there, as long as it tells a story. As mentioned already, there are lots of pics of scowling, posing creatures, which is a very kung fu movie thing to do. I guess that's the point. But I'd like to see less badass posturing and more badass action.