In my completely non artistic opinion, I'd say you could try -exaggerating the mouth a little more. Top Alice got it right -align their irises correctly, they might look like they're sneering more if they didn't look like they were staring off into space.
See, here's the thing, the parents are cute to me and I do not understand why other people get angry. It's literally like being colorblind. I don't see any difference between the mouths in that picture and mine, except that the mouths in 19207 are opened more downwards. So what particular elements about those faces cause the anger effect for you?
There's something really weird about the koreimu's mouth, but it doesn't make me angry. I just perceive it as a deformity. Like a human with a harelip or something.
Well which artist actually offend you? If there is one you should try incorporating some parts that make you mad into your own. Obviously when I make something scummy they look like a cross between Chucchuaki and Gesuaki.
Or...
If you really don't offend easily and can't tell, I've found things looking really cute and being little shits piss me off more than usual. Stuff like Shitai and Aquarium Guy makes/made my blood boil. I legitimately wish death upon Shitai's and Aquarium Guy's yukkuri and that's incredibly rare for me. Hell even Kiriraitaa's yukkuri anger me for just existing.
That's the thing, there's no artist so far that makes yukkuris which anger me on a purely visual basis. There's ones that disturb me or repulse me due to deformity or ugliness, but not anger or annoyance. So when I'm trying to make an anger-inducing yukkuri I have to go off other peoples' reactions without understanding what they're reacting to.
I know that alot of people find gesuaki's yukkuris anger-inducing, but I find them cute most of the time. Every so often when their expression gets REALLY distorted like in panel 11 of post #10654 I get weirded out, but I don't have an emotional response to it. Just 'that's a weird expression'.
Going off the cute things being little shits thing though, maybe I should just go with that.
I'm of the opinion that z-aki's yukkuri are seen as being irritating because of the eyes rather than the mouths. Specifically, the shape of the eyes make them seem . . . slow, while the upwards tilt of the lines as they congregate in the middle make them seem arrogant. The downwards slant of the eyebrows combined with the open mouths contribute to that arrogance, but aren't as important.
Strange that you don't find those anger inducing... This sorta goes into what people find rage inducing about yukkuri in general because I sincerely don't know. Their behavior and actions don't seem to matter to me either (and I realize I'm in a minority here); they could be the nicest nice head or the shittiest shit head and I would have the same reaction. And for some reason the "worm shape" seems to amplify my anger. No idea why.
But if you want some reference these are my honest picks for Acadyumy Award nominees for most rage inducing: post #22905 and post #50176
That actually seems to be close to it. It's like an exggeration of the 'classic' yukkuri expression with the down-slanted eyebrows and the square-oval shaped eyes.
sickweather
That's really interesting to me... we're like polar opposites when it comes to yukkuris. Even the shittiest shitheads like Yun Donuts' Marisa strike me as being cute. Those two pictures you linked as well have the same eye and eyebrow configuration as well. Maybe that's the element.
HankySpank
That one just makes me giggle. It's almost as funny as Yun Donuts' Marisa's derpface.
You have to understand that it isn't only looks but actions and attitude, cuteness doesn't matter, we had a influx of artist recently that can make cute yukkuris being disgusting and anger inducing out of being shitheads.
Smugness, Obnoxiousness, Arrogance, etc. It's that kind of things that make a yukkuri be anger inducing, basically being a embodiment of the most pathetic form of smugsnake, I like to think that a great deal of people here like abyuse of "smashing shitheads" kind out of their wish to see infuriating smugsnakes getting their due in ultra violent fashion.
The problem with this koalices is that, like poweryoga said, they look unfocused, I would dare to say they look like they smoked a joint and are now stonned HARD.
If you want to make it anger inducing remember the 2 key aspects "Obnoxious and Smug" try to think what kind of face you find obnoxious and smug and try to use it on your yukkuris.