Quote - OK, nice topology.

One general remark; increasing topology on joints.

You only have to increase on the outisde of the bend.

The outisde will strech in the bend, needing more polygons for a smoother flow..
The inside of the bend will crimp, and does not need the extra polygons.

Nice figure/model. Good Job.

Thank you!

It's much easier to cut an edge loop than it is to increase the polygon count on one side of a joint, so that was why that happened.  Also won't the mesh crease better as well if there are a reasonable number of polygons on the inside?  I have seen unpleasant buckling of a mesh on the inside of a joint when there aren't enough polygons, so it won't hurt to have them all round.  For some joints like the ankles there will of course be movement in more than one direction, so those will benefit from the all-round extra edge loops.