In both pictures the trigger is facing the same way so there can't have been any drastic change to the position of the gun. It's perfectly possible that they moved the bible, POSSIBLY to cover blood, but given that they believed Sheila to have been responsible I can see nothing suspicious or sinister in it.
A poster on here the other day said that despite what the police said - the first thing they would have done is pick up the rifle and ensure it was safe.
Now if that is true then it is very important because a big part of the case is that the scene looks obviously staged.
If it does appear like that but it is because things were moved before the photos then I think it is hugely important - because if the original scene was different then perhaps it did not look staged at all?
Also if they moved her hand onto the gun and that is what made the stain on the nightdress - then her blood was still wet.
The other statement of an officer said the gun was by her side and the bible at waist height.
To me that would make more sense because as she fired it the movement and her hand falling away would possibly cause the gun to fall to one side.