I'd be tempted to go sepia, or even an offbeat, kind of weird-ish split-toning look in Lightroom. The expressions on these two are hard to read. This is the kind of image that could be changed quite a bit by some digital dodging and burning. I think the shadow areas drop off too rapidly, and that there needs to be a bit more of some kind of a mid-tone level in there somewhere. If you want this to be a color image, I think maybe a warmer, yet sort of "vintage color" effect would work pretty well. This is a bit "different" from many images, which is a good thing.