These are not Pokémon

[Neslug]

The only thing that sticks out for me is that cheren's eyes are too close together, and his face looks a bit scrunched up, while N looks a bit stiff by his shoulders.

I would've fixed Cheren's eyes actually but if I pull both eyes apart one pixel they're too far away from each other and if I just move one, one is closer to the nose than the other which just looks even worse. I'll see what I can do about both points you brought up though.

Morty looks very good. His right shoulder needs not that highlight, however.

The reason I added the highlight was because that area seemed kinda flat and I wanted to have some dithering in there because it's pretty much the trademark of the style. It's not absolutely necessary like you said, here's a version without it:

The shoulders on morty don't seem even.

It might be because the left (our right) shoulder has his scarf going over it. Other than that, I assure you both shoulders are the same height and width.