Boston's art schools boast many notable alums. Painter Cy Twombly and photographer Nan Goldin studied at the School of the Museum of Fine Arts. Painter Brice Marden went to Boston University. Photographer William Wegman attended the Massachusetts College of Art and Design. Will any of this year's Master of Fine Arts degree candidates soar to the top? Here's your chance to spot them early: Many have work in thesis shows this spring. From a performance artist dressed as a '60s stewardess to an Expressionist painter, here are six of the shows' most promising artists.