Looks great! We personally use tripods (and trip over them a lot), rather than the top-down view because we prefer the "first-person" feel, but top-down is a popular angle and it works well!
Our biggest fixation is light, and the elimination of shadows, so we have tons of lights on all sides, as well as a white backdrop for reflecting more light in on the device. We find limited shadows makes for better viewing and fewer distractions. The shadows on your Lumix shot (4th image) really aren't that harsh, but you can try using diffusers on your lights, or add more lights to eliminate those shadows.
