Recently I've been auctioning adoptables of an original species of mine, and I was contacted by a reputable art doll maker looking to make art dolls out of them. They want to turn them into resin cast art dolls and sell batches of them, relying on me to make the designs, and in return they'll pay me $10 (the usual SB/flatrate I sell each design for) for each one, adding an additional $20 for each one that sells (making it $30, or my usual autobuy in the auctions).
I'm not complaining about it and personally think it's a fair price, but at the same time considering they'll be profiting off my original idea, should I be charging any extra for usage rights or etc? What I'm worried about is if she ever raises the price on them, and profits even more off my original idea- should there be a contract of some sort for something like this or even just overall for this kind of agreement? If so, what should it consist of and how would I go about doing one? I've never done anything like this before so I'm a mix of nervous and excited, haha.
Thank you so much in advance for any responses, I really appreciate the help /w\!