It's one of Okuda's trademark in a lot of his paintings. According to his wiki page:

"The work of Okuda San Miguel is predominantly characterized by geometric structures and multicolored prints. These are sometimes associated with gray bodies, and often include headless figures, religious references, symbols, animals and giant heads. Art critics catalog his style as pop surrealism with a clear street influence of urban art, though his style has not been exempt from controversy. His works focus on contradictions in existentialism, the meaning of life and the false freedom of capitalism, particularly on the conflict between modernity and our human roots."

https://en.wikipedia.org/wiki/Okuda_San_Miguel