Features over 500 foggy forest pictures by photographers like Ales Krivec.
Use a basic photo editor to crop the image to a 9:16 aspect ratio (roughly 2160x3840) to ensure the mist and forest details align perfectly with your home screen icons.
Most modern smartphones (iOS and Android) allow you to move and scale the image during the set-up process to center on a specific foggy hill or group of trees.