Not sure I'm posting in the right place, but here goes -- I've completed the attached drawing and now want to shadow it. You can see what I've already done, which is not very good. This is a pen drawing -- does anyone have any suggestions of what brush might create realistic shadows? IRL it's done in pencil, but I think that's what I tried here. Help for a noob would be appreciated.http://www.flickr.com/photos/mythlady/6779036887/ Thanks.