nice first shot, now do this
In photoshop, try USM 145/.4/0 You want to sharpen this right to the edge of oversharp. It's not tack sharp as it is and it needs to be sharp to have that wow effect. It looks like all the data is there for a nice sharp image so when I pulled it down and tried USM with photoshop it looked much better to my eye. The cropped version is much better. I always tell people to crop, crop crop. Crop it, then crop it again. I think you have it tight enough. LOL.
What causes the left side to have a hard edge outlining hte dandelion. The right side has no such hard edge, like somebody trimmed the undergrowth like a hedge on the left. It runs from about 1 oclock, counterclockwise to about 6 oclock. It is just barely visible on areas on the right side. Just curious.