Per Suetonius (Robert Graves 1957 translation, Twelve Caesars, passages 79-80 of Augustus, reprinted in 1989):
"Augustus was remarkably handsome and of very graceful gait even as an old man; but negligent of his personal appearance. He cared so little about his hair that, to save time, he would have two or three barbers working hurriedly on it together, and meanwhile read or write something, whether they were giving him a haircut or a shave. He always wore so serene an expression, whether talking or in repose, that a Gallic chief once confessed to his compatriots: 'When granted an audience with the Emperor during his passage across the Alps I would have carried out my plan of hurling him over a cliff had not the sight of that tranquil face softened my heart; so I desisted.
"Augustus' eyes were clear and bright, and he liked to believe that they shone with a sort of divine radiance; it gave him profound pleasure if anyone at whom he glanced keenly dropped his head as though dazzled by looking into the sun. In old age, however, his left eye had only partial vision. His teeth were small, few, and decayed; his hair, yellowish and rather curly; his eyebrows met above the nose; he had ears of moderate size, a nose projecting a little at the top and then bending slightly inward, and a complexion intermediate between dark and fair. Julius Marathus, Augustus' freedman and recorder, makes his height 5 feet 7 inches; but this is an exaggeration, although, with body and limbs so beautifully proportioned, one did not realize how small a man he was, unless someone tall stood close to him.
"His body is said to have been marred by blemishes of various sorts - a constellation of seven birthmarks on his chest and stomach, exactly corresponding in form, order, and number with the Great Bear; and a number of hard, dry patches suggesting ringworm, caused by an itching of his skin and a too frequent and vigorous use of the scraper at the Baths. He had a weakness in his left hip, though, and leg, which occasionally gave him the suspicion of a limp; but this was improved by the sand-and-reed treatment."
See also
the 1913 translation.
Passage 73 also notes that
His gowns were neither tight nor full, and the purple stripe on them was neither narrow nor broad; but his shoes had rather thick soles to make him look taller.
Finally, I'll note that he became Augustus at the age of 35 or 36.
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So, what do we have in Civ VI? The first thing that jumps out at my is he looks way too young. Perhaps if we were listed as
Octavian, but as-is, perhaps you could argue he was the age Alexander the Great was at taking the throne - 20 - but certainly not 35 or 36. That was one of my pet peeves with some of the Civ VI leaders, too, looking far too young.
Other aberrations... the Civ leader's hair is straight, not rather curly. The eyebrows do not meet above the nose. IMO the complexion as shown is fair, not "between dark and fair". He does look a bit short, but the shoes do not have thick soles. Handsome is in the eye of the beholder, and I can't judge the gait or how serene the expression is in a still. Similarly, I'll withhold judgement on how dazzling the eyes are until seeing them in motion.
Overall not one of my favorite depictions, especially since we have a decent amount to work off of.
As for the bonuses? I'll wait until I know more about the game before passing judgement on them.