In order to make an interesting shot of a simple item such as this you should probably try shooting it from a different angle. Maybe lit from one side so that the stronger shadow you produce has a purpose. Also you may try using a tripod to make your subject as sharp as possible. I'm also seeing some noise which could easily be eliminated using Neat Image or other noise reduction programs. Hope this helps.
It is hard to determine if the dots are concave or convex. I guess because the shadow of the domino is on the left, that they are concave. I imagine you hand painted the domino dots and perhaps the background as well. A 7,