Very interesting sketchbook. Some of your faces (and figures) seem out of proportion and are slanted, but I find them to be kind of interesting, especially in the first portrait in your first post. Hope to see more.
Looking good. I believe you need to start paying more attention to how you align the left side of the face to the right, and not have an eye drooping, or being hiked up. Flip it upside down and hold it up to the light. As soon as you see it horizontally flipped, you know exactly where you are off. A lot of these are great, but you seem to be making a lot of minor alignment mistakes, and are building a lot of detail on a poor foundational sketch.
Keep them coming, you're doing great. The key to getting it perfect for you is to just make sure you have everything positioned where it should be, and to keep your eyes fresh on these drawings. Looking at the picture backwards helps a TON. If you do it digitally, you can simply flip it horizontal and keep drawing. On that note, it actually helps a lot to work on a picture a little flipped one way, then a little flipped the other, but thats digital..