Keep in mind I'm a beginner myself, but I'mma try and help you out fam.
You should learn how to construct faces. I used loomis, and that helped me out a ton.
The biggest problems I see mainly on the left and top right characters:
>face features aren't aligned with chin and plane of the face.
It looks like you fixed this with the bottom right character though
>eyes and ears are way too small
eyes should be around an eye width apart, so if they're super small they kinda get the downs eyes. The top of the ear should be around eye/brow level and end around the bottom of the nose.
>features placed too high on the face
I'mma take a wild guess and say the bottom right character is more recent than the other two. It's gettin' better but still has some work to do.
Stuff that's good:
>hair seems to flow pretty naturally
>rendering seems like it's coming along
>body proportions aren't terrible
So if I were you I'd check out some loomis maybe, and focus on getting the faces right in the lineart. Keep it up fam, we all gonna make it brahs.
