I gotta get me one of those lenses. That's a lot of stuff in there. Somebody told me one time I had a cluttered image - less stuff then you got going on here. I don't find it cluttered. It's intersting to see into other people's lives and see their 'stuff'. Nice work.
Great shot. I feel like this just isn't a photo but a window into this artist's life. If I could make a few changes, I would remove the white notepad in the center bottom of the image and have the artist just a little more centered. The fisheye distorts the subject just a little too much for my taste.
On this photo you are not making the artist stand out from his studio. So, it doesn't classify to me as a portrait. I'd zoom in on him a little more, leaving some of his studio on the background- it would still work with the fish-eye.