i would recommend performing a test render to see how your object looks. you might not need to create more polys if the render comes out ok... for a quick test render i would recommend maya software set to production quality. that way there won't be any aliasing and you can see where jagged edges appear more clearly. i'd also render out to whatever size you plan on outputting to.

since your animation isn't based on deformations and is just simple rotating, having polygons of more than 4 edges is perfectly fine... especially since it looks like your texture appears correctly on your object.