It's likely we can't have real time lighting effects and shadows etc due to the high CPU cost on iOS devices (namely iPad2 and below) but sine the camera is almost fixed or only moves a bit vertically, I think shadows could be directly drawn without giving much false sense and but increases the sense of depth to current flat looking graphics. Those chrome ramp slopes also could have reflected image as texture rather than no shining dull gray texture. Table arts are so colorful and busy, without shadow of objects it's often hard to track quick ball movements. I think drawing shadows could be partial solution to this problem without costing CPU time.