In judging this challenge I don't ask "Does this photo make me want to eat this?" I ask "Would I want to hang this on my wall?" Your image works well in that regard. You have a good balance of light and dark and do a good job of capturing the textures of the different parts of the subject, such as the moistness of the frosting. The shadows make pleasing shapes,
I am very curious to see how a black & white of a dessert will do. Making the food shot as a B&W makes it a harder challenge to the photographer to make it visually appealing that one would want to reach in and take a bite. Without the rich brown tones this black & white chocolate just doesn't make the mouth water with anticipation of taste. The overhead shot is an angle that doesn't do this dessert justice for it lacks a defining shape. Is it a cupcake or a muffin top or maybe a brownie baked in a muffin pan? The decoration (?) laying flat on the table hints that it might be a cupcake but if I look directly at the dessert I can't quite tell with a 100% accuracy - show it off at a different angle where the shape is more defined and I think it might be more visually appealing to a larger audience.
This is a tough challenge to vote. I'm torn between "what are you trying to do here" and "what do I expect here". Further complicating matters is the question "what would I do here".
What I would expect would be a technically strong piece of eye-candy that would present the dessert in a way that I would want to at least sample it, if not order it. Along these lines I'm looking at technicals: backgrounds, distracting elements, exposure, sharpness. I'm also looking for creativity, imagination, and originality, which can make up for less than perfect technicals.
So, where does this leave me with your image?
Nice idea, but could use a little work. The exposure is a little imbalanced (not enough detail in the shadows to compensate for the strong highlights). Also, personally, I'm not a fan of bw food shots; I feel they rob their subjects.