The entire photo is in great harmony. The white and red (dominated colors in the photo) go really well together.
I’d probably like to see more realistic blood. But even so the way it is now it's awesome.
The model...hehehe...what to say about her other than she was born for this and she is very pretty and talented...any outfit would look outstanding on her.
The hair and the background are spectacular.
The medical (nurse) uniform matches the model greatly.
What mostly calls my attention is that the tube around her neck is actually tight and you can actually notice that on the photo.
The lighting is perfect.

Special shout out to the photographer as well (I’m not really sure who takes them) but congrats to him/her as well.

Sorry for my miss spelling. English isn't my native language.