Why are paintings of people in Egyptian tombs always done in profile instead of face on?

Egyptian painters had a very different way from ours of representing real life. Perhaps this is connected with the different purpose their paintings had to serve. What mattered most was not prettiness but completeness. It was the artists' task to preserve everything as clearly and permanently as possible. So they did not set out to sketch nature as it appeared to them from any fortuitous angle. They drew from memory, according to strict rules which ensured that everything that had to go into the picture would stand out in perfect clarity.

A similar method is often used by children. But the Egyptians were more consistent in their application of these methods than children ever are. Everything had to be represented from its most characteristic angle. Consider the effect which this idea had on the representation of the human body. The head was most easily seen in profile so they drew it sideways. But if we think of the human eye we think of it as seen from the front. Accordingly, a full-face eye was planted into the side view of the face. The top half of the body, the shoulders and chest, are best seen from the front, for then we see how the arms are hinged to the body. But arms and legs in movement are much more clearly seen sideways. That is the reason why Egyptians in these pictures look so strangely...contorted. Moreover, the Egyptian artists found it hard to visualize either foot seen from the outside. They preferred the clear outline from the big toe upwards. So both feet are seen from the inside, and the man on a relief looks as if he had two left feet. It must not be supposed that Egyptian artists thought that human beings looked like that. They merely followed a rule which allowed them to include everything in the human form that they considered important.

https://ancientegypt.fandom.com/wiki/User_blog:Egyking/Ancient_Egyptian_Art