First impression -- love the image, the tones and the light. Agree with the commenters about the sheet, I think it costed you quite a few points, unfortunately.
Techinicals -- I really love the light here. I would have like to see it as a more central composition, with rose and the gun equal distance from the edge. The focus is spot on, while the exposure on the model is good, the background seems a bit underexposed to me and is too similar in tone with the skin of the model.
Final thoughts -- I love the muted colors and the feel of the photo. Great composition and light. Good work.
If the muzzle had been just a touch lower (or the fabric background higher), the wrinkles in the fabric could have looked like smoke... Nice concept and photo.
I really like the light and how you managed the levels. If you did managed them, i think it gave a classy touch to this shot, one of my faves in this challenge. The border fits well too.
The fabric background looks a little crumpled (i don't know if i can use this word for that) and i wish the rose was more colored, saturated.
Nice shot, good luck! :D
PS: I'm not voting this challenge, just commenting!
PS2: Cute model!