Stock photography, photos: thinking Stock photos of man thinking Photograph: © Rob Wilkinson Click for a larger image and more information Keywords associated with this stock photo: man, male, 20s, 30s, thoughtful, thinking, pensive, looking, portrait, portraits, face, people, adult, adults, grown, up, grown, ups, white, caucasian, alone, portrait, Health, Beauty, absorbed, analytical, attentive, brainy, calculating, cerebral, cogitative, deep, engrossed, far-sighted, grave, intellectual, intent, introspective, logical, melancholy, museful, musing, philosophic, pondering, reasoning, reflecting, reflective, serious, studious, subjective, wise, wistful