ooof...not trying to bash your art or anything, but the shading feels super-off with the colors. Maybe I'm just used to more facial harmony or something, but they look too Super-realistic at the face and then everything else below goes totally off. I feel like that's a major issue and...honestly, not sure what you should do to fix it other than re-do the whole lighting.
the individual pics stand up far better than this does, sadly.
....but the designs are really awesome and it looks great otherwise.