Matt, its an absolutely fantastic piece of sculpting, but the first thing that jumped out at me was the size of the brim of the slouch hat.
It may just be the angle of the photo, but it looks a bit large to me, more like a western cowboy hat than a slouch hat.
Please don't hate me for pointing this out, but I know what you mean about going blind after looking at something for so long. I think the brim could be trimmed a little bit, but otherwise it looks spot on.
Do you intend to release this commercially?? If so, I'll buy one. That's the best compliment I can give.