“Mickalene Thomas: She�s Come Undone!” Lehmann Maupin, New York, NY. Through May2. Roberta Smith: Yet there is a fast-food obviousness to these paintings. Their potpourri of contemporary precedents is too easily parsed: Kathe Burkhardt�s raw images of Elizabeth Taylor, Robert Colescott�s racial indiscretions and the decorative (often beaded) overkill of […]