Shutter Speed W1

So today for the lesson we were experiencing how to shoot with AV and practicing to take photos at different shutter speeds. I found this very interesting because I had never photographed with AV mode, and never tried panning before. I had always wondered how other photographers do that, and today my questions were answered.

I personally don't like this photo, as it's too bright. The shutter speed was at 1/80. 

So I then got them to move places, and go to a place that had a bit more shade. With the same shutter speed at 1/80, this was the outcome. I like this photo much more better than the other one at 1/80. 

With the shutter speed at 1/250, I got two of the models to move, while the other one was to stay still. I also didn't like this photo, as it's too dark. It also doesn't show the motion well enough. 

At the speed of 0"3, I got a much better panning photo. Also it's a lot more brighter, and more interesting.