Your 'square' concept in this image is easily understandable. The lighting is aslo nice and even for the image... I like the soft shadow underneath the plate on the front side.
The image lacks sharpness. As I look at your camera settings, I am a little lost. I think that the ISO 400 setting may have kicked your shutter speed up. I believe that a lower ISO setting would have slowed down the shutter, provided some more color saturation and possibly increased the sharpness of this image a little. I'm not sure what resolution the F601z is, so I'm not sure how to comment on that part...
Compositionally, this photograph is fine. It's nice and symmetrical and well-centered in the frame of view.
Good composition although I think an even higher angle would have been better.
The lighting seems to have a red tint. Maybe the auto white-balance failed or maybe it's the natural colour of the background. If that's the case then I think a white background would have been better.
I know it's nitpicking, but you should have positioned the blade of the knife to the left side. Somehow that's what strikes me first on this image ;-)
your knife is the wrong way around ;-) less compression might help with straighter edges (less jpeg artifacts, e.g. in the fork). the rules allow for a file size three times as big as the one you have here.