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I like the pink frosting and cake idea. I do think however that you took a good idea too far by creating / using that hot pink background. The pink in the frosting and cake is much more pleasing to look at, but is completely dominated by the background color, which isn't the most flattering shade. Against a white or neutral background, the cake really would have popped out at the viewer. Just my two cents.
Yummy. I don't know about the lighting setup. The light from the back casts plate shadows into the picture and shades the near surfaces of the cake and the cake slice. It is also pretty intense on the background on the left. Great focus and depth of field. A 6.
Not bad at all. I wish the shadows weren't quite so harsh. It just doesn't have the "reach out and touch it" feel to the lighting, if that makes sense. It's definitely pink, and I like the composition. Good job.