it justs says that the Image will be shrunk to 440 pixels wide. doesn't tell me much more about the size. As for the look I really don't know, maybe it should have an oblique line in the middle to separate the two halfs, the top-left to the bottom-right. I would put maybe some grass or HC as the pattern of the top and maybe a player hitting a shot (you see in my signature my faves, so you can look for one of them) and in the other half snow and maybe a skier (in slalom would be even better).
I know it's kind of a huge request, so take your time and if you wanna sign it, feel free to do it