Wow - that's a vibrant pink! The grayish area in the lower left is a little distracting - my eyes keep wandering there instead of staying focused on the flower.
Nice clarity, the centered composition with a square crop works nicely here. Nice DOF, and personally I always think these dark backgrounds work well with floral shots, to me it seems to make the flower pop even more.
Very pretty radiant pink and yellow, and nice control of the DOF. Only nitpick would be to clone out those few specks near the bottom left hand corner of the frame.