Good practice using a shallow DOF.
I think it worked against you in number one, because all the flowers are basically at the same level, I'd like to see them all in focus.
I don't really like the composition in 2 +3, the subject is too centered.
Good focus in 4, but maybe a tighter crop would bring the subject into more of the frame. I realize you probably didn't want to get any closer and scare it away and were probably as zoomed as you could get.
The composition is 5 is much better, but it looks a little overexposed. Maybe try turning up the contrast and reducing the exposure in post production. But the colors are great.
I like 6
7 is the best of the bunch for me. I like the DOF and it's like the flower is "looking" into the frame.