1. Human hair on anthro characters
in shows like Lacadaisy all of the male character's fur are shaped to resemble hair (or they dont). And then the female characters for some reason has a full set of human hair. Its just looks wierd. You managed to give the male characters "hair" but gave up on doing the same to the female characters. There is for shure somthing you can do without making it look stupid and out of place. OR: just dont give them human hair. It works well with male characters. Why not for females as well?
2. Unnessesary big boobs/ass
I know i can say theese character designs are sexist (and they are). But thats a low hanging fruit to say. But we all know why theese characters are created for: degenerates with a porn addiction. I am talking about like impossibly large that just cant work if theese characters were real. Like how does ppl find boobs the size of big kettlebells atractive? I dont reely mind if a character has a bit "more" but when one boob is bigger than the character's torso thats when i have a problem with it.
3. More than 3 or 4 main coulors on the design
When it comes to coulors i think you can handle a bright rainbow coulorscheme. One example is Dreamy Bowser from M&L Dream Team. Where i think they handeled the coulors insanely well. But what i dont like is when a character uses more than 3 or 4 main coulors on the design (depending on how complex the character is). Of course you dont have to restrict yourself to just 3 - 4 coulors and avoid anything else (this issnt the days of the NES anymore). It just clutter the design when you add to many. And you also need harmony witch yeah issnt the easyest to master but it issnt that hard to fuck up. Of cource im using the tousands of deviantarts OCs as an example. I know theese character are made by young kids with little experiances. But you cant tell me that they think that more coulors = better character design. I am omiting black and white from this rule bc they are just a shade that that issnt reely a coulor and it practicaly fits all coulor combos (just dont use it as an substitute).