Thats the SKy material…. try a few different HDR images and watch the difference.
I just used your image but your that artist had a building and stuff so just find the image you wan to reflect and put it in.
You may want to add models to the scene maybe some bounce boards.
Slight motion blur will really help sell it too. (Very little since everything is so slow)
Depth of Field is also a nice touch in the youtube clip.
/Randy