Wow, I didn't know these bloomed! I like how the DOF here hints at the entire plant. Your using the rule of thirds works well too. It is also nice to have those other blooms out of focus for contrast.
Good shallow DOF, but as I look at the picture, I feel it would be stronger without the out-of-focus jade plants. The single sharp plant against the out-of-focus leaves gives a great 3-D effect and still meets the requirements of the challenge.