With “Boulevard,” her latest exhibition at Fraenkel Gallery, Katy Grannan continues her subtle subversion of the idioms and codes of portraiture, a titillating project that has invariably drawn her to the marginal and marginalized, documenting an ever-expanding cast of offbeat characters and social outcasts ranging from the banal to the poignantly strange. As in previous work, Grannan’s images traffic in a poetic awkwardness that stops just short of the grotesque, and it is this finely honed sensibility—which mixes prurience and detached observation—that has positioned Grannan, rightfully