These are really good. I especially love the Tachikoma and Tetsuo. XD And Jack Nicholson. You've got a great start to a sketchbook here, especially with the anatomy studies and the color studies (like the closeup of the eye- wow!), and though I normally would say to try to stray from too much anime, it's obvious you have a good understanding of realism as well, so I won't bother. XD I'm almost ashamed to say that when I saw that first anime picture, with the heads at different angles, I recognized it immediately because I own that book. But it's in storage anyways.
Keep up the good work! I'm really impressed with your abilities. ^^
You can be the best at what you do, but you've never learned everything about anything.
Thanks for the comments... I know, anime is one of those guilty pleasures of mine (it's one of the things that got me interested in drawing in the first place). I try to refrain from drawing it but sometimes... well, I'm weak...