Just some ideas – a little CCW rotation, tiny bit more contrast, crop the foreground to get rid of that dark band completely, cut the whatever it is from the left, but leave a bit of the window on the right to keep the picture in context.
Or not.
That looks like a great shot to me FF. Nice tones and full of character. Be nice to see it bigger to make out more of the detail. Off to your Flikr now to check it out :D
The composition is good. I would only do bigger crop, to have only the fiddler and the case. I think that to see more his face is more important than the surrounding wall and floor….