Here are three of the most amazing blogs that I follow. One is a professional photographer named John Paul Foster, he is incredibly dedicated to his craft, and respectful of the maiko and geiko he photographs. He even has a book!
John Paul Foster Photography
Here is the blog (updated 5-10 times a month) of the okaasan of a Miyagawacho okiya. My japanese isn't good enough to translate, but the candid photos of her maiko are adorable. She also has a thing for Japanese style garden gnomes...
Lastly, I think this is a blog put out by one of the more avid maiko-stalking photographers. Their shots are incredible, and they take millions of images. A lot of fun to pour over. The link I'm sending you is from a recent misedashi in Gion Kobu. <3
Gottuan's Room Blog