While I was modelling this model in blender, once I got to the arms I noticed that in render the shading on the arms and lower body was cubic. I'm not sure if this is a lighting issue or a polygon issue, and I don't know how to fix it.
The Suns are set to raytrace. The issue doesn't occur with 1000 x 1000 renders, and can't upload an image due to it being over 2MB.

This one doesn't have any problems.
This one does.
