I am currently working on a commission piece for a 3D character. This is my first time doing character work, and I've found enough resources on anatomy and whatnot, but I haven't found much on retopologizing a mesh for rigging. There are some resources that cover the basics, but I would like to know how to outline muscle groups to allow for proper deformation (like blendshapes in maya). I know that I'm supposed to outline the muscles, but I haven't found much on how. I would like to gain a fundamental understanding of how different topology affects the rig.
I am working in blender (but planning to switch to maya), so something that is software agnostic would be helpful!
Any help would be much appreciated! :)