Some 'types' of Pixel Art are frequently classified as drawing rather then spriting*. I believe 'Oekaki' is one of those styles, don't really know for sure though, never bothered to look into it. Usually pixel art is just considered spriting as opposed to Art in the sense of traditional drawing, digital art and other activities.
*But this is only really on forums wich focus primarily on art and/or pixel art, which is not the case for MG.