I can recommend a book by Jayne Shrimpton, "Family Photographs & How to Date Them", published this year. I attended a talk she gave a few months ago at the Soc'y of Genealogists and the small details that she finds in photos enabled her to date some of mine to within a couple of years.
Barry 1936
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Hepburn - Clerkenwell, Islington, Limehouse, Grays Cowell - Stanford le Hope, Erith, Orsett, Grays Powell - Sheppey Kent, New Zealand Williams - Llanferres, Clwyd