here's a pretty cool little art reference program called "Handy."

A few years ago i had used Poser for head reference with the light sources like this (mostly because it's all i could figure out how to do in it), but i like that this is a small dedicated app for pretty much these select few crucial purposes, and with a load of ready-made hands in tricky poses, ready to light and rotate however you desire.

http://www.handyarttool.com/
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