I always click "Don't recommend channel" when the thumbnail looks like this. I don't know if it has improved recommendations at all, but I certainly don't see it as often, which is nice.
Funnily enough it's changed since before, and the open mouth "oh my God" face gets less views than the generic smile. This, according to Mr. Beast who did an A/B comparison recently.
Hate the guys content, but it seems he knows his shit