This is an icon, after all. It's clearly just a model screenshot, which I don't like.
Since it's supposed to be round, you could at least edit your screenshot, round off the corners to make it look better. I also suggest taking a screenshot slightly at an angle -- You'd think you're supposed to take it head-on, but trust me, everything looks better when you tilt it slightly to the left/right and up/down. Look at every icon in Warcraft; just about every single one of them tilts to the side a bit.