Cool Sketchbook you have and great work ethic. You're doing a lot of work and you're improving all the time. You're at your best with animals and landscapes. That's why it's great that you work so hard on human anatomy. You're awesome with pencil by the way. Keep doing those self portraits it will definately pay off. Take a gray scale photo of yourself and use it as a reference for one of them, so you can really observe the values! Keep doing what you do!