A) Using copyrighted work without proven owner consent (plagiarism) is strictly forbidden, and you must credit all other artists work. In other words, if you're selling textures or images using art or work that you didn't make, then post a link to the original image.
Going to close this thread since you haven't really proven you own that that head, as well as you selling the free textures as a set. You should only sell the head, and give the free set for free. Do not reopen to sell the head unless you have proof from the ZainabQuartz that you can use/sell it.