Using a less busy background would have been better.. the contrast would have been better and the motion would have been more obvious.. and the light is a bit weak..
What were you thinking with that background, its far too distracting, a nice simple, neutral background would have been far superior. The colours in the background are dull and really let the main subject down. Perhaps if you had greater DOF to make the dice sharper and the background more blurred, then converted to mono / duotone and push the contrast hard then IMO this might have been saved.
The background takes focus away from the dice and is overpowering the shot. A solid background would've helped a lot. Also, the light source is too weak.