Hi Joel and Charlie! Thanks a lot for your comments & edits, I appreciate them hugely!
Regarding #1: I did not crop out the upper-right lights because the back of the actors are in such a position that they would have been cut, but the solution was a smart combination of crop and clone-out, just like Charlie did (thanks)
#2:/#3, the one with ropes: true, the ropes are disturbing, I still liked the "basket like" shape of the subjects. Appreciate your comment!
#3/#2, the one with the faces in pitch black background: totally right on the "air" on the upper part, I should have cropped a lot more aggressively. I see that Charlie left the air on the left, and I can see his point (actors are turned to the left)
De-noising and sharpening: I actually did. De-noising with 25 color and 50 luminance setting on LR4. Concerning sharpening: I'll open a thread about how sharpening works in LR, it's definitely not clear to me. Anyway, I guess I've been a little shy on both fronts.
Thanks again for the precious comments and edits!