Answer
He appears to be flattened front-to-back but with still at his normal height.
Work Step by Step
To the people on the street, Mr. Tompkins is in a moving frame of reference, and appears compressed in the front-to-back direction, because that is the direction of his motion.
He appears to be his normal height, because vertical length measurements are perpendicular to his direction of motion, and are unaffected.
