Not bad, they all look good. I do have to say the first two, look like they where designed in your early stages of designing. Which if correct does show a really nice progression to where you are now.

I do like the motion art touch you added, very nice. The only one that looks a little too much is the "Las Vegas" design, it looks like too much is happening in the image and draws attention from the main objective.

But nice, none the less. keep it up :)