Try to introduce more imperfections as possible. But not too obvious. For example: a texture map with scratches for the pawn. Make that is almost not noticeable. Also a texture with smudges for the pawn. A very light bump map (maybe brushed metal, or subtle dimples here and there). And you should work on the shadow of the pawn. The reflection suggests at least 3 point light sources above in front of the pawn. Cast the shadows accordingly. And yes, you need shadows, otherwise the pawn could the illusion that is floating. But make the shadows very soft and not too atenuated. The reflection on the chessboard should be toned down a little. The Blender raytracer don’t has it yet: blurred reflections. You see the head of the pawn in the reflection is as sharp as the base in the reflection. But most people won’t notice it anyway. Also I find it very strange the chess board is very polished (hence the reflection of the pawn in the chess board), but the reflections that you see on the pawn are not visible on the location, or in the vicinity of the pawn. The texture in the foreground shows artificats --> use a higher resolution texture. I think that’s about it. If you manage to take all this into account, I think you’ll have a render that’s undistuingishable from a photo.
PS: a focal blur would be nice too.