I'm not leaving you ****ing douche.
Just because, someone is under the age of 18, it doesn't mean they don't understand the concept of making their own artwork. I, for example am 14. I also, don't give a **** if the game companies care, or not. The fact is, using someone elses artwork, to make your own look better is ripping.
Why would you advertise? The company certainly didn't ask you to. Some do-good mother ****er doing it out of his or her own free will? **** that, nobody advertises for free. That is just a crappy excuse for ripping. If you want to advertise for something, do it for a friend, not a bunch of people you will never meet in your life.