I love Lisa Yuskavage's oil paintings. Although her treatment of the female figure is often controversial [not so much in the images I have posted below -- these works are rather tame for her], her use of color is simply incredible.
She is represented by David Zwirner in New York.
Lisa Yuskavage, Big Little Laura, 1998, Oil on linen, 76" x 96"
Lisa Yuskavage, Persimmons, 2006, Oil on linen, 48" x 72"
Lisa Yuskavage, (The One's That) Don't Want to: Bad Baby II, 1991-1992, Oil on canvas, 34.1" x 30"