This is beautiful. The colours are lovely, the focus is spot on, the ultra-shallow DOF makes the petals quite abstract-y, and the bokeh is absolutely gorgeous.
I really like the minimalist feel that you've achieved here with the large amounts of empty space. However, I feel that there's a little too much space at the bottom of the frame - it makes the image feel slightly unbalanced (in my opinion) and I think cropping a couple of centimetres of that away would help. Otherwise the composition is great - the curvature of the petals helps to lead the eye to other parts of the image very effectively.