I created my Pinterest account quite long ago... I used it just sometimes to find some suitable pictures for my projects, but mostly I just saved them somewhere on my computer. But it is not very comfortable, as I always need my notebook to check the pictures I would like to use. So Pinterest is a good way to have an access to your favourite pictures and images at any time (if you are online, of course :) )
I decided to work a little with Light/Shadow effects and made 2 small sketches using photo references. One of them (with Coco) has really strong value division and contrast. The 2nd one (Frida) has light from the back, which I found as very impressive effect.