Modeling the Female Arm tutorial | free3DTutorials.com
This model shows very well laid-out topology, and it overall seems well proportioned. This would be the kind of density I would probably go for for retopologizing a human(oid) character.
Picked up by CGchips. 2D,3DCG tutorials and 3Dprinter news site. http://cgchips.com/
Animation-friendly character topology