He likes specific details of what you'd want on it. For example, I chose the pictures for mine and asked him to blend them together. So you don't have to be hugely specific but providing details will help him give you exactly what you're looking for! His username on the forum is TheHarbinger, he's "Harb" ingame.
Oh thank you! I didn't create it. My best friend did, he's a graphic designer. If you'd like something by him feel free to make a request. He's always looking to to gain more experience ^_^