You might try the following:

Kamakura Bungakukan
1-5-3 Hase
Kamakura-shi, Kanagawa-ken 248-0016 JAPAN
Tel: 81-467-23-3911

The photo is a cropped version of one published in Bungakutoshi Kamakura 100-nin (文学都市かまくら１００人）published by that institute about 3 years ago. I am sure they have others in their records, or could direct you to the appropriate copyright holders.