Next time, please don't choose semi - rotten lemons... A shot like this really really needs pristine fruit. Also it's a little dull in the lighting department.
This is nice, although by drawing back, opening up the apeture and then cropping it tighter in the post production would have helped it by allowing more of the lemons to be in focus.
Good composition. I like how you played off the reflections of the knife. I wish the photo was a bit sharper and brighter, but overall it's a nice photo.
Interesting framing. Lemons lacks creativity and the background is distracting. I admire your use of image within the frame and the use of the knife to point the eye, like and arrow, toward your focal point. The juice is also a nice touch.