Caesar was a successful general about to crown his career by ascending to the throne. His loyal friend, Marcus Brutus, loved Caesar but hated the tyranny that an imperial ruler might impose. In contrast, Cassius envied and hated Caesar. Like commanders before and since, Caesar had to contend with the milieu of human emotions, aspirations, and contentions that swirled about him. Discerning intentions and fathoming substance behind images was as much a problem for Caesar as it is for today's leaders.
Image can both portray and betray reality.
We don't like to think of the grossly overweight Major General William R. Shafter commanding the soldiers that Teddy Roosevelt led up San Juan Hill. Shakespeare's Caesar felt that fat, bald-headed men who slept well were satisfied with their lot dealt by the gods and not susceptible to the destructive ambition that drove Cassius. The image we see in a mirror may or may not reflect genuine substance. Perhaps the man or woman staring back at each of us is truly a dedicated military professional, properly accoutered and reflecting the benefits of a rigorous physical fitness program. All to the good, then.