This is the perfect subject for sepia. If you cropped out the modern guy in the shadows on the right some would think this was real. Add a little grain and it would look authentic. Love the tones you have acheived.
I think you did a great job with the sepia tone. I do like the photo a lot. I'd suggest burning the area in the lower right corner so that the man with a drink is not as distracting. Adding some grain would give this a real old feel, too.