I first considered using markers as drawing for the fact that it is very similar to ink and brush artwork. After saying that, I decided it also depends upon the level of usage. Example, if I draw something and put a touch of color on it with say... watercolor, it is considered a drawing. If I draw and then apply watercolor to the point it obscures the drawn line then it is most likely considered a painting.
The dictionary says:
"Draw- to produce (a picture or diagram) by making lines and marks, especially with a pen or pencil on paper.
Paint- to produce (a picture) by means of using paint."
Simple, no? NO!
Now this brings up the pastel issue. Pastels come in various forms from crayon to pencil. How does one discern between the two? I have seen pastel work to be considered both painting and drawing (look at Degas' work). What makes a painting a "painting"? I think it depends (ha ha! It always depends!) upon how the medium is used. One thing I have figured out is if there is layering and a building of textures then most of the time it would be considered painting. AAAAH! But then again I have seen fantastic drawings with layering and layering of line work. Oh woe! There always seems to be exceptions to the rules. Share your thoughts with me on this.