No, it's not bumps, but rather the LDraw to POV converter's inability to smooth the geometry of minifig faces. If you use LDView to export to POV, its smoothing just doesn't work right on the faces. (L3P doesn't perform smoothing of mesh data, only curved primitives, so its output isn't any better.)
However, if the faces were modeled as textures over a blank face, the smoothing would work. The next version of LDView will support the textures, but probably not in its POV export. I'll likely only do the work for POV export support of textures if the LSC ratifies them.
However, if the faces were modeled as textures over a blank face, the smoothing would work. The next version of LDView will support the textures, but probably not in its POV export. I'll likely only do the work for POV export support of textures if the LSC ratifies them.