Anonymous3: I'd guess it's anime/manga inspired, though it could also have some roots in newspaper comics.
both of these have roots in realism (with a few exceptions), but simplified for print/animation
these features mentioned are most often referred to as Sequential Art, whether a part of a series of panels or not
Anonymous4(3): addendum:
once you get past the art style, you then have the artists style or techniques that bring variation to the core style
so it's actually adorable because Snapesnogger drew it that way, not because it's sequential art
Comments
both of these have roots in realism (with a few exceptions), but simplified for print/animation
these features mentioned are most often referred to as Sequential Art, whether a part of a series of panels or not
once you get past the art style, you then have the artists style or techniques that bring variation to the core style
so it's actually adorable because Snapesnogger drew it that way, not because it's sequential art