This is actually not a bad way of documenting shot glasses.  From the look of it, the glass is sitting on a glass plate supported on  two USPS boxes.  The window placement provide ample natural light and the cloudy day ensures that reflections and glare are kept to a minimum.  

The main problem here is that the background is very cluttered and because the glass is clear we have a difficult job distinguishing the label from the noise. 

Fixing this would have been relatively easy.  The first option would to have been to drop the camera by a few inches so that the lens was  looking up at the glass.  The background would have then have been sky - to see how effective this can be, take a look at the "Old Continental" photo in the pre-pro.com database.   The other fix would be to get much closer to the glass.  This would make the background drop out of focus and create a nice soft green blur against which to shoot the glass.  Getting close to a glass is a very effective way of losing the background because the plane of focus becomes extremely  narrow.