Whenever I lose inspiration I just take a break for a few days. I'm online a lot, and I usually find some piece of art or a photo that slams my creativity into overdrive in no time at all. Try to think of some artists or influences that've inspired you in the past!
Study life study life study life!!! Drawing from life is the single best way to get a better grasp of anatomy. Another way to improve is to go to a bookstore or a library or something and check out some anatomy books specifically geared towards artists, and draw FROM them! Just spend a while copying photos of people, and you'll notice yourself start to improve.
Hey, this might not be helpful anymore because you posted this in October, but... try to look at the photo you're drawing as a cohesive whole, and less like a jigsaw puzzle. Look at how large the eyes are in orientation to the nose, and the ear. Look at the shape of the head- really try to block out the overall shape, and figure out /where/ on that shape all the pieces fit. What you have (or, by this point I guess it's "had") is not a bad start, but I think you dove into doing details a bit too early. Block out the large shapes on the face first, and /then/ whittle down the details. After you get those right, then go onto rough shading. Front-facing faces are notoriously difficult, but you have a great start there! :D
