Been a while since I've dabbled with pixel art, I made these just for fun, it's for some kind of tactical space ship game. (Which may or may not turn into an actual game.)
I've been studying up on manga style faces, mostly for the mouths which I always have a hard time with.
At first I tried doing the faces at an angle, but it would be too much work for multiple animated portraits with different expression.
I'd like to make more parts of the face to change when they talk, but I'm not entirely sure how.
I'm also not sure if the helmets look different enough to easily tell them apart, I'm thinking of having different colors but that might look messy.
Another idea I have is having a 'near death' state, in addition to the 'wounded' state, where the head is angled down and the eye sockets are just dark.
Here is an animation displaying how it looks when they talk and take damage.