"Gaifu Kaisei" from Katsushika Hokusai's "Fugaku Sanjurokkei" (Thirty-six Views of Mt. Fuji). It is also commonly known as "Akafuji" (Red Fuji). Fuji shines red in the morning sun, a phenomenon that is depicted with concise composition and colors.
This is a vertically cropped version of Red Fuji. A horizontal cropped version with almost all the figures is also available, although not all of them due to the aspect ratio of the case itself.
Both iPhone and Galaxy cases are available.