Naturally, leaving it alone is always and option..............primarily, I simply do not like it and I'm exploring other possibilities post exposure, since I was powerless to climb up there and tighten up those seams before exposure. I don't agree with the characterization of "falsifying", but that's ok. So at a minimum I may just spot out the white lines in the shadow and call it good.
Really, it's a (technically good) photo of an object you don't happen to like; I don't see how trying to mend it is going to be any improvement, left or right.
If you insist, there's a couple of things you can do:
* In the negative, bleach out the dense bit that's supposed to be a shadow on the wall. If you use rehalogenating bleach (ferricyanide + bromide) you can go back and redevelop it if you overdo it. If you're happy with the result, refix the negative to make the change permanent.
* Also in the negative, you could add some density on the seams with a very soft pencil and a fine (continuously sharpened) tip. It'll never be perfect, but at a casual glance the seams may stand out a little less.
* In the print, you could develop and stop a print, squeegee it and touch the bit that needs to be a deep shade with a fogging developer. Then fix the print as normal.
* Alternatively, touch up the crack in the shadow with dyes, but no guarantees that the result will age particularly gracefully and will hold up to light shining at the print at disadvantageous angles.
* The dark seems in the figure you could try to fix in the print by masking the adjacent areas with something like rubber cement or something else that will block out water and can be removed later on (perhaps certain types of easy-release tape will work as well), then touch up the dense bits with bleach or Farmer's reducer.
Whatever you do, I'm afraid that nothing, not even your technically excellent recording of the scene (I say that without any irony), will be able to fix the glaring and massive problem - which is that this is ultimately a mindbogglingly tacky figure stuck to an equally tackily finished faux-natural stone wall and lit in the most tacky way imaginable. In all honesty, I think the little seams are ultimately a nice touch to this display of utter kitsch. Please don't take this personally in any way, and there's of course no accounting for taste, but I honestly believe that those little imperfections are the only bits that bring a little sense to this scene.