The photo of Mick & Brian with beards seems to be from January, 1968. rollingstones.com has the following archive entry for January 18, 1968:
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www.rollingstones.com]
"Back in London, Mick and Marianne continue to play the part of hippest couple in Rock. Not averse to a brush with the British aristocracy, they attend a party thrown by the Duke of Bedford for The Supremes. Brian comes along as well. On this rare occasion, both he and Mick are seen sporting a beard. The same day, Brian is seen at the launch party for the new band Grapefruit at London’s Hanover Grand. The Beatles’ John, Paul and Ringo also turn up. Grapefruit are the first signing to The Beatles’ Apple Records label."
Some sources have the party for The Supremes dated as January 28, but all seem to agree that it was sometime in January, 1968. We know that the beards were gone by the end of April when the JJF promos were filmed.
--- January 1968, I don't know the photographer for this one
--- January 1968, Daily Mirror Archives