A ghostly face and a walking figure arise out of a tangle of clothing in Thornton Dial’s energetic 2007 work ‘Winter Jackets.’ The late self-taught artist returns to political themes in this show – the first since his passing in January. Here, we ponder the movement of a solitary (uniformed?) individual who strides forward with purpose. (At Marianne Boesky Gallery in Chelsea through June 18th).