One of the interesting aspects of looking at the blending of the Greek, Egyptian, and later Roman cultures is how the art evolved to reflect that.  The  Egyptians had a distinctive style that, while animals were depicted with a certain realism, humans were not.

    The reasons why Egyptian art was done in that awkward style reflected three ideas.

1. The people creating the art never considered themselves artists they were copyists. They replicated in stiff, formal lines the divine works of the God Ptah, the creator, and patron of craftsmen and architects. Artistic expression was never the goal of their art. The goal of the imagery was to depict the human form symbolically. The chest always presented forward. Feet and legs are done in a side view, and the head has a side profile eye. The goal was never to give a realistic portrait but rather to present the symbol of a king, priest, or queen. 

2.  The Craftsman who painted or sculpted the images for public venues, tombs, and royal palaces believed that their depictions were a form of magic. Supernatural forces needed to be channeled and used beneficially by the pharaoh and the country. Therefore the art was laid out on a grid system and rigidly reproduced to the correct angles and maintain the balance, symmetry, and harmony that was to be encoded into the depiction.

3. The art was to guide the soul in its journey through the afterlife. It was functional and maintained order reflecting the rules of their world. The gods were the biggest to be directed, then the Pharaoh, down the line. Neutral expressions were purposely placed on the images so that the spirit of the deal would not be locked into that moment for eternity. 

    The melding of Hellenistic art was seen in these Graeco-Roman Funerary Stelae from Upper Egypt.  The figure stands face forward while being flanked by old gods in their typical depiction. The deceased is recognizable, the gods acquired from the Egyptians maintain their traditional stance, and their symbols stay with them. It is that idea of two different cultures coming together and keeping that constant comfort of maintaining the afterlife gods but also giving more realism to an individual person who the living must mourn. These sculpted wall art for the tombs, in their own way, was a reflection of the new society forming in Egypt and how it sorted what it would keep and what it would jettison in its creation.

Sources :

Graeco-Roman Funerary Stelae from Upper Egypt Hardcover – 1 October 1992 ISBN: 0853231257

Roehrig, Sue D'Auria Peter Lacovara Catharine H. 1988. "MUMMlfS &MAGIC The Funerary Arts of Ancient Egypt ." Boston Museam of fine Arts exibit catalog 204.