How is my singing? Videos included!?

You have a very pretty voice naturally, and obviously a great idea of how to sing. I think that if I were to make it sound a little less like you were talking and more like you were singing (which is often developed over time, known as a "singer's accent"), it'd sound perfect. For example, when you say "wonder" and "forget" in Lithium, try singing it more like "fuh-get" than "furr-get"... it just doesn't sound appealing. Other than that, good job. You have a lot of natural talent. :)