There are not really any rules but we try and keep things within the boundaries of good taste. If you feel that your article needs the picture than include it but if you feel it may be crossing the line than maybe your instinct is correct.
Basically take a step back and see what your article needs and can live without and make a judgment call. We try not to censure too much unless absolutely needed.
When I die, I want to die peacefully, in my sleep, like my grandpa did. Not like the screaming passengers in his car.
When I think of To Live and Die in LA, it's not about people with their faces shot off. The only violent scene in any movie I can think of that is absolutely essential to the plot is Murphy being shot to pieces in the opening act of Robocop.