hmmm.... I happen to create and visualize point of sale in 2D and 3D for a living, and "photo realistic" these are not, they are OK, average, quickies. One day max to build the model, less if you have the bracelet already done, day rate of £350 in my field, after that changing dials is done in minutes, £60 an hour as per set of amends...these are not primitive 2d sketches and they cost you a fortune, but we provide our clients this service for almost nothing
this is high end by tim cooper[way better than me, and expensive]
http://www.behance.net/gallery/3D-Mo...Imagery/250315