He accepted the prize wearing a T-shirt with the slogan ''White girls can not hump''.His provocative work has also featured in the Sydney Biennale and last year's art + soul exhibition at the Art Gallery of NSW.Another finalist for the Sulman, Kate Beynon, who painted Lotus Qi Gong Goddess, said it was the gallery's choice to pick the artist, ''and they would know Richard is a character and he wo