Great composition and focus in this shot. The colors are nice and strong, and the shallow DOF is superb. I like how the border really contains the photo well.
I like this shot, it's a little close to not being on topic, but since part of the flower is in focus I guess it's still somewhat a picture of a flower and not a picture of the bee.
This is a very nice macro. The flowers in it, however, serve simply as an out of focus background for the bee, not as the main picture elements. For this challenge, I think that the flowers should really be the centre of interest.