If I were to use a lineart reffed off of your stock and post the finished image to dA, with proper credits in the comments section and a link for you to the finished product, how would you feel about the drawing then being submitted to Howrse.com? There's a sort of virtual voting process that allows players to choose coats that they like best to get through the game, and then the players who got coats through get virtual currency. I'm 100% understanding of your conditions, and if you require credit for the stock image it can't be on the coat image (that's the rules, sorry :/) but there's a personal profile where I can upload an image of the coat and give you the appropriate credits there as well. This project hasn't even been started (heck, I haven't even finished my current one--I'm getting there though, xD), so don't worry about rushing to get back to me. Sorry if this sounds weird, by the way, it's my first time talking about stock references for lineart.