Not to take anything away from this guy's technical abilities... but he is working from photographs.
So it seems more like ballpoint pen "reproductions" as oppose to original art. I know it's subjective & splitting hairs, but knowing he's doing a detail for detail reproductions of other's work kills it for me.
Speaking from a purely technical standpoint, yes it's amazing. But from an artistic standpoint he's not really adding anything to the images. Why would anyone buy his ballpoint pen reproductions when their essentially indistinguishable from the source?
/debbie downer