Can you see a histogram for this image? Depending on the contrast you want, you can tell a lot from the histogram with black and white photos. This article might be useful if you use Photoshop, or even if you don't.
I love my b&w pictures high contrasty. My mentor always told me a true black&white picture should always have a pure black spot and a pure white spot in it, otherwise it's just a greyish&grey picture
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http://www.photoshopessentials.com/photo-editing/histogram/
As for the photo, I think it is very nice - there's a low contrast with the subjects, but they are in high contrast to the background.