I wanted to show that both characters, although from different universes were similar in that, they were both taken control of by the evil, whether or not by choice. I gave Harry the eyes of a snake to represent Nagini as the last Horcrux to free him from his possession, which is also why she is wrapped around his neck. Frodo, I gave the obvious ring as well as putting the eye of Sauron within his own. I also mixed the symbols and gave it a stormy background to emphasize the evil going on within. It really shows how they are both alike and very different.
I fear that part of my drawing was cut off, I hope that doesn't hinder it too much.