Cool, yeah makes sense, the actual point when I'd be using these portaits is genuinely years off (if it all) so I'll have a play and see if i can make them look more 'human'.

The humans look more like zombies tbh. Perhaps avoid using black outside of the global outline, it's too contrasted with the face color.

Also using antialiasing on the global outline is a little weird, especially since it's black. Again, it is so contrasted here it would look better without AA, to clearly separate the sprite from the background.

I hope it makes sense. Otherwise the base line looks fine. :)