I really like it too. I have grown up, and continue to live in Las Vegas, so sights like this I can only get online, or by traveling a great distance. After seeing Parkin's edit I now know it was the vibrance/saturation of the colors. Here in Vegas we rarely get clouds so it looked a bit un natural to me, but I assume that that's just how things appear over there.
Interesting idea, I had never thought to clone movement out before, but personally I usually leave a ghost or two(only with people) as I like how it can add a bit to a still image by introducing an element of movement.
Glad you like it. I'm sure there are lots of interesting things to photograph in LV though. Having spent a bit of time in the US, I can confirm our skies and clouds do apples quite different.