Here's my thoughts. On the way the photo is now, it does seem too sterile, as others have said. Every death investigation I go on, where Paramedics were involved anyway, there always seems to be more evidence of the chaos created by the life saving measures. Whether it be open packaging thrown about, a ball of used gloves laying on the floor, spots of blood on the sheet, an empty IV bag hanging, stuff like that. The little details that represent the ultimately futile efforts. Usually if the decedent is this clean, they would be sitting in the back of the funeral home van, not the ambulance. I also would like to see this shot at night, with the e-lights shining in the background. So that's my C&C on the image as it stands; add paraphernalia of the life saving efforts and a little more ambiance.
Now, if I were going to re-shoot this, here's my idea of how it could be more compelling. I'd like to see it shot from the back of the ambulance, at night, with the e-lights going, back doors swung wide open, the decedents feet exposed from under the sheet, but the rest of him/her still covered up, though leave the exposed arm hanging. Then put a Paramedic in the jump seat behind the body, and have them either with a leaned back posture with hands in lap and eyes closed, or leaning forward with head in hands. I'm torn, too, on whether I would like to see it taken close to the feet, so they are larger in the frame and using good DOF control to throw the paramedic just enough out of focus, or if I would like to see it shot a little further back and put the focus on the paramedic. Probably the latter, since the paramedics emotions are what we're talking about.
Hope that's helpful.