Here we have an experiment with glass and light, two very different looks, it can be a complex material to photograph being clear for the most part and being apt to appear dull without defined edge or shape so as usual it’s all about the light or how you position the light. The first shot is what is known as bright field lighting and the second, known as dark field lighting. The characteristics of both styles involve defining the outline of the glass against the background for example: dark edged glass against a light coloured background and then a bright edged glass against a black background. The light source for both these pictures is from behind the glasses. Interesting as well is the fact that in both pictures the glasses are standing on a piece of white card.
More of this type of theory of photographic lighting can be found in this excellent book called Light, Science and Magic which I highly recommend for anyone who wants to understand the principles of light.