I like the use of desat here. It really gives a lot to the meaning of the photo instead of just being used for the sake of using it. However, I think this would probably score higher if you were to use the full 640 pixel size limit.
The image is just too busy ... too much to look at with nothing for your eyes to really land on. Zoom in / simplify / look either for a strong subject or a strong pattern without a subject.
The selective desat is interesting ... but not too useful in that it's so small it's almost unnoticeable at a quick glance. But at least it does force the gaze upon the flowers rather than the grass.