So here's my piece of glassware.

I also did it on a white background but it didn't turn out well because I metered wrong. It just goes to show that the slightest mistake in commercial can be the death of your image. Oh, also...I actually had to retouch this black-background shot a lot because I didn't take the time to clean it well first. So take 15 mins now than 2+ hrs later.
^_^