You know, this isn't bad, but to be honest I'm surprised it's ranking an 8.1 after 15 votes. There seems to be very little shading, if any. You have a good choice of colors, and you can obviously paint with some accuracy. However, you need to really work on shading. And, if I may be so bold, you really need to thin down your paints. Especially the metallics, as they thicken up faster than regular paints. It looks to me like your paints are spreading on pretty thick. PS. Interesting background photo.