If you want some quick feedback, here you have:
- That ‘aqua’ text color… Phew!
- Document’s title should be inside the head tag.
- Href on img tags should contain an absolute path if the image is hosted anywhere else but your server.
- You set a margin left of 20% to the #description which breaks the layout, IMHO.
- The landing page only passes 10 out of 16 tests.
Anyway. As I said, it’s a very good starting point!