Well again, one could argue that drawing--and all classical styles of art--are merely OTHER FORMS of art and that one does not necessarily have to come before, or be connected, to any other. I think, for me, the ultimate question is this: Does the artist produce something that I enjoy looking at or that speaks to me in some way?
Take Marla for instance. I really like some of her paintings, particularly Zane Dancing (the red/orange painting against the black background in the OP), but I know that she does not have a knack for realism. In fact, the last I heard, she was taking lessons to learn how to paint in more realistic ways. But that doesn't change the fact that I like some of what she has already produced with her original skillset.