Hi Rani,
As a rule of thumb, Legal advice is usually worth as much as you have paid for it. As you are asking for free legal advice here, what you will likely get is something worth less than nothing. This isn’t a dig against you or our community, it is just the troth.
I work as a designer and have been sued for infringement in the past. What I found out from the situation is that you can be sued for pretty much anything, this is especially true when it come to college copyrights and trademarks. The question is often not if you were correct in your use, but rather are you willing to pay in the $10+K to try to prove you were correct in your use. As most of the the items we make are not worth this amount up front, you will just give up at that point rather than fight for use in the case of a claim.
My rule of thumb is be original. If you get a claim and your not making money on the item, just let the item go.Lastly, don’t use content that you do not own while trying to make money. Many artist blur the line on the last item and never get burned, this doesn’t mean it is legal, it just means they didn’t get in trouble.