Thanks to all who gave comments. The "red" vase is actually purple, I was going for two sets of complementary colors. However it didn't show up purple enough on some people's monitors, I guess. Someone pointed out that the entire background has a purple cast, which I didn't notice before. "Automatic" white balance failed me again.
I'm unhappy that there is a clear line between the two sheets of paper that I used for background and to cover the table. There's also a light tilt downhill, from right to left, caused by a tripod with a crappy vertical adjustment lock. Oh well. I'm happy with the score and place. Thanks again.
This would have been a more successful demonstration of the effect of complementary colours if you had removed the vase with the yellow flowers and just gone with the red/green complementary contrast.