I like it, but I have two points.

1. To help mapping, I suggest starting out with a canvas twice as wide as it should be. Scale it when you're done. This will map properly. (Thank you Pate5.)

2. When you were doing the gradient for the skin at the beginning, instead of trying to line it up with the guide, you could hold Ctrl for a "constrained angle". It would have auto-aligned itself up and down. Yeah, it only saves a few seconds, but time is valuable.