That x3d file looks fine to me, Rock, I don't see that there is anything wrong with it. I would disable the spinning lights, and turn off the shadow, but those are more preferences than anything else. The image you posted however seems to contains a jpeg rather than a gif, so you may have chosen to Export instead of Export Animation?

Lighting these things is an art in itself, I tend to have two lights above the midplane, and one below, and have bevels like rounded or 30/45/60 degree, then adjust the lights to catch the bevelled edges as the coin spins.

Mike