It's based on his emoticon that he uses on his avatars mostly, but I added my own personal style to it. I wanted it to be stamp related because he is known for his numerous amount of zany, random, hilarious stamps. Plus, I have a love for stamps myself, so I was quick to try that theme.
The golden "P" on a red wine type background is a kind of royal theme. I was going to put a crown there to represent Prosaix as a sort of "King of Stamps" on dA, but I chose to opt for this choice instead.
Oh yes. The shake. I had to keep it in the avi, because what is our king of stamps without his emote shaking that random object.
So yes, it is recognizable as a Prosaix type avatar, with a touch of my flair.