I decided to give it a try for fine art.
I was pleasantly surprised by how nicely one could blend without the aid of paper texture. It was buttery smooth paper, but by constantly changing markers, I was able to lay up gradation.
The first two images are of 5 minute quickies. They aren't very good-- still trying to get a handle of the markers.
The last image was about 2 hours, give or take. Pretty happy with it. Too bad marker can't erase though-- couple anatomy issues...