What a great collection of coasters! I love how they are just randomly placed...no real order. I think that the picture is in great focus, I know that sometimes the coasters are not printed in sharp tack focus so I didn't hold that against you. The color is a little flat for me also. I would have maybe upped the saturation of color just a little..not too much. Maybe if you had a nice cold beer sitting on one of the coasters it would have made a difference...not sure. Voters seem to like water drops for some reason. I think that you did a great job. I didn't look to see where this picture placed in the challenge but I am sure it was better than mine! LOL
I think some of the coasters needed to be shifted into that blank spot near the center. Its drawing my eye there. Other than that, it is a fantastic photograph.