Happy Birthday to a Beautiful woman is a celebration of artist Mickalene Thomas's mother and muse, Sandra Bush, who has been the subject of numerous photographs and paintings by the artist.Happy Birthday to a Beautiful woman is a celebration of artist Mickalene Thomas's mother and muse, Sandra Bush, who has been the subject of numerous photographs and paintings by the artist.Happy Birthday to a Beautiful woman is a celebration of artist Mickalene Thomas's mother and muse, Sandra Bush, who has been the subject of numerous photographs and paintings by the artist.