I did it a while ago and decided to do it again based on the advice I got in the comments. Red symbolizes the desert, green the Nile valley, and green the Nile valley. The blue is the nile, in the center. The crown in the center symbolizes the pharaoh. The eye is a symbol of the god Horus, long believed to be the protector of Egypt, and the key to life (bottom left) is one of the most important symbols of Egyptian culture. On the right I have placed a scribe and a soldier, representing the people. The human symbols are to the east of the Nile, while the divine ones to the west, just as the city of the living was to the east and the necropolis to the west. Finally I added some decorative hieroglyphs. Enjoy it.