I also discovered a great Tumblr blog for facial reference - http://humanae.tumblr.com/. Not ideal if you're looking for dynamic angles or lighting, but great for practicing skintons and looking to study different facial features. Like a lot of artists, I catch myself painting the same faces over and over so this is good practice for me.
I also tried to make myself get up a little early to go for a run on alternate mornings. That...has not worked out so well. My motivation to go outside and move my feet is apparently at an all time low first thing in the morning. But it does make getting up to sketch, knowing I can stay in my pajamas, much more appealing!