Not bad. I like it. The only thing that I would change for sure would be the white round brush mark near the center of the render. Just seems to stick out like a sore thumb to me. If you're doing it more lighting effect, then I think you may need to make it less visible or put it on the border, near the bottom. So only half sticks up. To make that effect more apparent, you may want to up the brush size too. Good work overall though. Keep em coming.