As for the Egyptian murals they wanted to represent each body part from the most characteristic angle. If you don't like these check their statues instead. But in any way their mind wasn't centered on the human body itself, but on human life and afterlife.
However copying reality (I assume this is what you consider talented) wasn't a concern, I don't think even in Grease. Even in case of fat roman emperors and such they might not reflect reality tho I can imagine from all the cultures of the antiquity they'd wanted lifelike representations.








