I was actually thinking along those lines when I shot this, and I have about three more test shots that excluded the dirt (but the red part wound up out of focus). Maybe I should blend this one with one of those other shots and repost.
I would it leave as it is, or crop the shot instead. Its done, it would be fixing after the fact. Ok I admit in fact I also sometimes fix afterwards! But usually not, its bad habit because its compensating for the own sloppyness (IMHO).
And by the way, after I suggested more sharpness, I wasnt so sure for myself if that was good advice. Im not sure about it anymore. If I imagine this image completely sharp... it could be more like... everything is said, one factor more that is defined, but its living from the mysterious part, so maybe it would weaken it. But then you never know until you see it. A identical pair of images except for the sharpness would be interesting to see what that changes.