you say this is for non-human, if you are adapting human you must remove subtleties of shading, a similar case in opposite genders is flattening nipple, but still having areola.

Morphs only propagates in straight line so there is distortion you can see by applying tile node.  for the simple test, I am using spots healing brush on a human skin texture.

 I have only made the small image, but you can click to make it slightly larger.