Bad coom art and why it is bad

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I want to discuss bad/unappealing examples of coom art, that way we can learn from these examples and make better art.
I chose this picture because I think it has several of the bad traits I see in a lot of bad coom:
1) Grotesquely exaggerated anatomy
2) Stupid expressions (why is the smug coomer grin so common? Who actually makes that face during sex?)
3) Trannyjaw, something western artists seem to love
4) It’s just boring to look at

What are examples of your least favorite coom art and why?