Wow this is wonderful. I'm so glad I clicked on this. :)
I like how you highlighted the bird's outline, and the way you've suggested feathers with your pixel clusters. kutgw
I think the circle at the top could be adjusted, if not with AA, then with just a smoother circle. Maybe a few pixels added to the top and bottom.
Very good, I can imagine this being an awesome metal album cover.
This is so SICK