The phrase "abstract watercolor" refers to a type of artwork that uses watercolors but does not try to represent something specific. It is more about the patterns, colors, and emotions created by the artist. Full definition
An original, abstract watercolor portrait painting of a young woman with cat. (1stdibs.com)
But they have earlier ancestors in British art: the more abstract watercolors of J.M.W. Turner and perhaps the 18th century landscape drawings that Alexander and John Robert Cozens developed from ink splatters. (mysanantonio.com)
Contemporary abstract watercolor painting by French artist Fabrice Penaux. (1stdibs.com)