Superb Rob. At first I thought you had used the X3 fill light in SSP. Sliding that fill light back can work wonders with the light and soften an image. Love the look whatever and the lines and forms in the first image for me are as good as it gets.
I like the first one because of how the light is focused on the bridge. I think it would be even better had the fourth string been picked out like the other three are; maybe it's a nylon string?