Nice idea - I wanted to do this shot, but settled on something else. Decent job, it's well in focus. I feel I want less on the bottom of the shot and more of the fingerboard, to me that would be a more interesting composition.
For me the only thing that takes away from this image somewhat is the lighting - I would have liked to see it a little warmer and without the harsh reflections (IMHO). Wonderful idea for the challenge.
It's not clear to me that of all the bridges to be found among the viols this is the most perfect one: it seems to be of very different vintage than the rest of the instrument and I find that distracting; I love the body of the instrument especially its worn details. And I like the ebony finger board (or whatever it is) but the bridge doesn't have the right 'patina.'
Hurrah nonliteral interpretation!
Looks like the lighting is a table lamp or something of the sort. A nifty trick to avoid unsightly highlights is to stick a piece of cardboard or the like between the subject and the light source- this makes the lighting indirect and thus even and subtle.