Wasn't it minerjones who pointed out the Chicago Bulls reference? You gotta give him a free coin as well, right?
I know you don't want to read more criticism, but you may want to change your art even more, because, as smoothie pointed out, it looks too much like the Stifel statue.
You don't want Stifel coming after you, especially after you've sold and delivered the product. Sorry to say, but I would start the drawing from scratch, just to be on the safe side. The concept of a bull and a bear fighting is a good one...just don't make the design such a duplicate of an earlier piece of artwork that people are challenging you on a public forum.
The feedback saved you a LOT of money. Imagine if you found yourself in a lawsuit with the Bulls or STIFEL if you had not heeded the advice from posters on the thread you started. You are lucky to have a community where you can get honest feedback...one without bias.
I look forward to seeing your end product and I wish you success. You have gotten farther than I have in minting a coin