A good idea but there's some camera shake on the left and over exposure on the right...those aren't necessarily evils but here it kills the photo -- pun intended.
Interesting idea, with nice continuity via the stethoscopes. The lighting looks a bit harsh, though, and could be sharper. Mainly I think this would be stronger if the skeleton were a bit further to the left. I'm not sure the third doctor is needed. 5.
Nice composition, but I think it would have been better if the heads had been included. The photo is quite noisy and lots of the lines are jagged. The image is only 81k - you may want to consider saving it with less JPEG compression and making the most of the 150k size limit.