you're doing a really fine job. It looks very clear. Second is a bit less clear, but I think it might be due to shake.
You're getting a little grain, which is ok. If you can resize it a bit smaller, it might help get rid of grain. There are programs like "Noise Ninja" that helps get rid of that too.
But otherwise fantastic work =)
What is your camera setup you're using and what is your post processing?