Pretty good, though there's a bit of banding where your strokes overlapped. Damned if I know how to fix that, though, I tend to stay away from color with traditional media.
Otherwise, it's pretty solid. You might want to try coloring with Photoshop or GIMP, though. Less texture to your fills (unless you put it there by hand) but it's quicker and cheaper than buying markers. Well, GIMP is. Photoshop isn't really "cheaper" than anything.