The modeling looks really good, peaveykat. The materials and lighting need some work.
The shadows are really harsh and dark. Notice in your reference, the ambient light removes almost all the shadows except those underneath the tray. You can do something similar by adding fill lights (low power hemi lights pointed opposite the main light)
The black areas on the glasses are probably caused by the Ray Transparency depth being too low, probably it’s set at 2, the default. Try increasing it to 3 or 4 to see the difference (it costs in render time, though.)
Since you’re already paying for Ray Transparency, you might as well toss in a bit of Ray Mirror, too. The table surface and the vase could stand to be a bit reflective.
Finally, I don’t particularly like your color choice for the tabletop, but that’s an artistic issue, not a technical one, so feel free to ignore it.
Welcome to BlenderArtists.