Great shot. I don't know if you rotated the shot or the flowers, but the way they seem to reach for the light gives this image great life. The composition is great, but I would like to see it square rather than a little off. I think the right side could lose the extra little bit as there isn't as much interest.
The colors , composition and lighting...A very nice still life capture. But I must say for this challenge I'm looking for something more than just an OOF background, it seems almost featureless. Perhaps if there was something OOF in the background I could relate to. In any case, this is a very pleasing shot to look at :)