Yeah seen a few of these before, my favourite is the Goblin tying the girls toes together, do you have a version of a white girl in the same situation?
I do my drawings entirely in CorelDraw (currently using CorelDraw X3) and I tend to do a drawing and then do one or more variants with different colors and details.
Cool are you planning anymore drawing of this nature?........... i'd love to see a follow up to the above pic, i really like the goblin tickler thing.... specially if he could tickle or lick her feet while she is tied like that....