Just as I clicked the "Add Comment" button on my previous comment, I realized that I should have included a warning with the link I included - they are *very disturbing* images.
Wow! Gayle, you really know what you're doing! This is real, honest-to-gosh photojournalism.
This is a very powerful photo - the symbolism of the guitar and the candle is compelling. Yes, your cropping is very strong- I think that isolating these 2 elements adds to the stregnth of the image - more so that if we were to see the faces of these people.
As far as tone, I think it would have been nice to have been more crisp, but overall, that is minor in comparison to the emotional impact.
Unfortunately, I believe that rallying "for peace" and singing Kum-ba-yah is the wrong approach when one is dealing with this: