Digital Sketchbook...40 portrait challenge

I joined a new group on Facebook, a 40 portrait challenge. Faces are not my typical, so rare for me that this is the first I've ever done.  

The challenge is to create forty portaits, in any media, and to your own timeframe.  I decided to work mostly on my iPad.  Jan Spakowsky sponsored this one on Facebook. The inspiration over there is amazing.