|Greetings from the Critique Club!
Initial impression: Oh dear. Someone didn't like the reading they got! :-) I gave this one a 5. Why? Read on...
Technical: This is where you did very well. Small aperture, long exposure on a tripod, using a terrific macro lens (I've shot with it on a borrowed Canon), the lighting is very well done, all in focus.
Artistic: Composition is a little on the safe side, I would have liked to see a
victim err, patient being subjected to its use...even in its broken state. Just something to give it a little extra push from being merely a technically good pic, to one that is technically good yet also tells a story.
Overall: Respectable finish and score. You're definitely on the right track, just try a little more on the artistic side and imbuing shots with a sense of what's going on, and I think you will do very well.
Feel free to PM me with any questions,