poser is not so expensive. but zbrush is andother software. so i think a lot of people dont have zbrush.  zbrush is for sculpting. you can also make body or face morphs for poser figures.  its a very practical tool for making figures more interesting.
blender is having some good sculpting tools. i think you can also make a displacement map in blender.

why am i mentioning this here? because blender is free. yes free. its a little hard to get used to the software because its a little different. but its free. with a sculpting tool like this you can transform apollo maximus( free) or Michael 4 to anyone you want.

www.blender.org/development/release-logs/blender-243/sculpt-mode/