Contrary to what some are suggesting, (angle of photographs accounts for rile barrel appearing to be resting against neck / throat in 27 as opposed to 32), you only have to study the detail in this image to confirm that the barrel is resting against Sheila's neck:-
"Shadow along length of barrel is consistent along its entire length, which would not be the case if the end part of the barrel was in the position shown in image 32"...
It is not physically possible for the barrel to be resting on the left hand side of Sheila's neck as it appears to do in photo 27. Look at this b&w photo:

The rifle butt is central to her body, laying as it is along the line where her legs meet. The trigger is roughly in the groin area, and the gun changes angle at that point and draws a line from the groin to the right hand side of her chest, and because of the angle the photo is taken from appears to extend up towards the point of her chin. If viewed from a point on the floor beside Sheila, the gun would also elevate along its length from butt to muzzle, because in a person of normal weight the legs and pelvis are quite a bit lower than the front of the chest when laying on the back.
Now photo 32:

The butt end of the gun is still central to her body and the barrel is still resting on the right hand side of the chest, so that the gun is actually pointing slightly towards the photographer and is also raised towards him. You can see that the barrel is actually a few inches above the neck and collar bone by the shadow. Because of the angle the photo has been taken the barrel appears to be foreshortened.
Photo 27:

The butt is still central to her body, and the barrel still angles from the groin across the right hand side of the chest. It is physically impossible for it to then touch the left hand side of her neck, because it would have to bend not only in that direction, but also downwards. What you are seeing in 27 is the barrel in front of and above that side of her neck, and it is also lengthened by the angle of the photo. If you still don't believe me find an average sized woman, lay her on the floor with a stick in the position of the gun. You will see for yourself exactly what I describe.