What you might want to do is grab the pencil tool and define the edges some more, pencil tool is not anti-aliased and will result in a more crisp texture on lower resolutions. Also you might want to up the contrast on the face , you can hardly distinguish the eyes and mouth from the rest.
I second the Lide, but all I've ever scanned in are pencil drawings. Honestly, scanning pencil drawings...is not rocket science. :p Just give your drawing enough of a margin to avoid parts getting cropped off. I just use the grayscale scan at 300 dpi and tweak the levels in Photoshop.
Did this as a collab with my friend Will ( http://www.studiobam.com ) he did the pencils and I did the coloring. It's going to be in the BloodRayne comic coming up next month. He did the pencils back when BR2 shipped, I just barely got around to finishing it... buahahhaha! my bad. Just thought I'd share. Sometimes it's…