Great work - thanks! I liked #18 most because it is somewhat interesting. #16 is not good because I prefer white background to keep it simple and less noisy. #17 and #15 both have more orange, something I liked, but something is missing in all your designs and I cannot really tell it. Perhaps not as simple and elegant as I am looking for, I do not know.
Thank you very much for reviewing my designs. I do really appreciate it. Here is a new proposal for your consideration (#21). Please don't be hesitate to let me know for any revision request needed.