Not really an interesting composition, as it has no clear focal point, rule of thirds seems to have been ignored, few leading lines; which are contradicting eachother, bad use of depth.
Regarding tonal values, it seems to be overexposed and lacking in detail. If you wish to see how to successfully work with tonal values, look up work of Ansel Adams (B&W photography as well), who works with such.
The lighting seems to be too strong, as if the photo is taken in the midday light, making it seem flat and not contributing to shadow quality.
Typical family vacation photo. Besides the african tribemembers of course

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