Just want to step in and say that the humanoid direction is great fun and you should keep at it! Maybe try pushing the facial shapes a bit more to get it to be even more bird like, really just push the hell out if it until you think you have gone way too far and see what it looks like!
The snapped horn with the energy leak is a nice touch too, play it up some more. Maybe get that same effect coming out of some other places on him, the tattoos or talons.
Maybe try thinking about it as he was originally a bird man but tried to change and the spell only worked partially, try sticking some partial wing stumps on the back.
Your cauldron design is delightful.
Anyways, I really like it and hope that you keep on going with this guy, because he is fun.