https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/6074392
Mackerel Sky Clouds
ACES. Margaret Barse. A sky covered with rows of altocumulus or cirrocumulus clouds resembling the patterns on a mackerel's back. Original public domain image from Flickr
Public DomainFree CC0 image for Personal and Business use