Just some tidbits (not explicitly Babylonian, but used by other civilizations of the time) since I'm taking an art history class at the moment and we just skimmed over this era...
On statues or most kinds of art:
A beard on a man (whether they had one in real life of not) as added in as a sign of wisdom. (ex. I believe it's a statue of Marcus Aurelius that shows him on a horse and having a beard when in real life, he had no such beard. It as merely added to signify his supposed wisdom)
Wings on any person or animal claim some sort of spiritual power or protection. (ex. the winged, lion statues of Nebuchadnezzar have wings to signify how he as protected by the gods as a warning to his enemies and an encouragement to his people)
Partial animal body (or animal with a human head) was use to show the strength of a ruler. (ex. again, the winged, lion statue signifies how powerful of a king Nebuchadnezzar was)
That's all I recall from today's lecture...

if I chance upon any free time, I may just dive into this more myself

(Ooo! There was also a somewhat cool explanation about the ovens Shadrach, Meshach and Abednego were thrown into... Did you realize when they were heated up seven times hotter than normal, they were burning at approximately 21,000 degrees?!

(they normally burned at around 3,000 degrees to bake and glaze bricks)