Oh. Seeing it as the choice he made to walk his own path, and not highlighting the choice he had to make between these two... That's a way to look at the piece that I didn't think of at first. We see so much misunderstanding of this character out there, I feel silly not to have understood what was really before me for once.
Very nice! I love some of the compositional choices you made here. like the elfin guy's head tilted slightly up and the demon dude's tilted down. Even if they weren't obviously celestial and demonic that alone would tell me who the good guy was. I am not familiar with the characters but given Illidan's anatomy it looks like he is already leaning toward the darker path.