If I'm not mistaken, and maybe H can confirm since I think that was one of the batches of photos we sent back and forth and discussed years ago, that photo may be from Spector's "Christmas Gift For You" sessions at Gold Star, 1963. Am I remembering that correctly? If so, Brian was at those sessions and famously tried a piano take or two before Spector pulled him...lol.
So related to that photo, which is an earlier one of Leon Russell...paraphrased from a story taken from a Cher interview in a magazine: Look at Leon's hair. Seriously.
When Leon first came to LA and started to work his way into doing these sessions, Leon had a pretty wild head of hair that no one seemed able to cut properly or which he could manage. Lot of cowlicks, hair sticking up, etc. You can kind of see it in this photo. As he started to work sessions regularly and make better money as a result, someone recommended he go to this particular expensive hair salon for a haircut. This was outside Leon's realm, and the haircuts were quite expensive.
So one day he shows up at the studio with an amazing haircut, he looked terrific. People asked him about his hair, and he said he went to this place that charged him a lot, but they styled his hair and put some kind of pink gel in his hair that made it easy to style and comb.
And if you see photos of Leon from the more middle 60's, like when he was producing Gary Lewis and others, his hair did look pretty damn good, thanks to whatever that salon did for him.
So it's funny to see that earlier photo after hearing Cher's story about Leon going to a real salon for the first time in his life after he made enough money playing piano to afford it!
Then there's the legendary story about Leon showing up completely wasted drunk at a Spector session, preaching some kind of fire-and-brimstone rants, and telling off Phil while standing on top of the grand piano, but that video is readily available for anyone interested.