Thats neat, I think you did really well for your first. Did you make the image yourself? Its kind of pixelated as well.
I don't see anything wrong with the layout, I think you did a splended Job for your first div layout.

Oh perhaps align all the links in the navigation to text-align:left;
and take that <center> out of it.
Then it will be aligned and perhaps look a little better.
Great job