Concert, D7000 + Kit Lens. How did I do?

We went to see Take That in Manchester on Sunday. I was pleasantly surprised by the kit lens on the D7000.

Focus was accurate and I'm very happy with the results so far. Most of these were taken at 105mm with a high ISO (1600+). They were also cropped heavily due to the amount of waving arms in the crowd.

I'm still learning how to use the D7000. How did I do? Any advice.

--
http://www.flickr.com/photos/22051839@N02/