Hi, as requested, here is an indepth critique of your submission.
First Impression - the most important one: Too shallow DoF and blown highlights hurt what could have been a pretty decent photo.
Composition: Compositionally, not too bad, I most often like the diagonal cutting of a photo. This one though I think I'd like to see the flower head down in the bottom left corner of the picture. With less stem and more negative space, I think you'd have a much stronger photo.
Subject: It stands out well from the background, although I think the flower head (the main subject) should be more in focus.
Technical (Color, focus, and light): Color is a bit warm. I suggest a custom white balance for working under lights.
Focus: As I mentioned earlier the DoF is a bit shallow for my taste. However, this DoF would work if you had focused the camera on the flower and then recomposed the shot.
Light: A bit harsh and it's blowing some of the highlights.
To grow its vote?: Generally flower shots have to be excellent to score well at DPC. Voters don't treat flowere kindly around here :-( Bad voters! LOL Really though a few technical issues here could help you out a bit.
Summary: Not bad for your third challenge here. Keep on shooting and you will definitely see better scores.
Lighting on the flower is too harsh. The background is unappealing and does not compliment the flower at all. The composition is fine. As for focus, it seems to be on the bud below the petals rather than on the flower itself.