The private pilot, with one passenger, was on a personal flight to search for a missing friend in an area of remote tree- and snow-covered terrain. The pilot said that while flying slow and maneuvering at 75 feet above the ground, his passenger saw the missing man lying on the ground near a snow-covered meadow. The pilot reported that, as he started a right turn back to the meadow, he added engine power and initiated a climb but that the right wing stalled. He said that he initiated a stall recovery, but that the airplane descended nose-down into the trees. The pilot said that there were no mechanical problems with the airplane prior to the accident. The airplane sustained substantial damage to the wings, fuselage, and empennage.