Holy wow. I really adore the dull glowy eyes and the magic. The wings look fantastic too. I think it would make a great cheaper alternative, and in the end probably rope you in more money. This way you'll have something price-wise in the "in between" range of cheap (sketches, for example) to fully digital drawings and the likes. Gives people a little more bang for their buck, too. I think it'd be a nice idea to offer them. They really do look fantastic, and I'm sure I'm not the only one who thinks so. :) Hell, I'm half amazed this is considered a 'sketch' anyway. It looks that good!