Oh hell yeah, that would totally work. I like the design of their website and iconography okay, but I think stuff like this could be the default. It's all logical, sensible, and distinct- very good job.
Why don't you stick with the shotwell original colors. RGB. The Back stays Blue, the front pic is green and the camera hue red, (but then again it might look like a record button than a camera) either way it would state still life. Always on. Always remembering. The thing is i like the format and structure of the icon but the icon could still stay intact with the original. Giving reference and honor. That's just me though. Love the work.