I can definitely vouch for Nero's work, it is fantastic!
He has made me a beautiful UI before, and I've seen him work on countless other projects and designs. What makes him stand out a bit from the crowd is the effort & time he will put into your orders, and how personable he is. He will make sure you are involved every step of the way and touch it up until you are 100% satisfied. Highly recommended if you are looking for a GFX artist, check him out!