I like the clean, simplified cartoons a ton, they look really solid. Thor looks great too.
Other faces-- looks like you have a tendency to draw "almond eyes," even in 3/4 view, but it could be intentional.
Do you do much any life-drawing? It looks like most of your drawings are built from body anatomy and head studies, and that can make your faces look less unique. The characters don't have many features on the surface that set them apart.