I definitely echo the sentiment that Marion Cotillard tends to be lackluster in print but in the case of this cover IMO the fault lies more in the photography, creative direction and / or curation. To me if someone would have just adjusted her freaking hand then the photo would be a winner.
Re the same person being on the cover of the different editions of the same magazine in the same month, to me that is not a big deal as magazines tend to be distributed locally. The typical subscriber or newsstand buyer in the US does not know or care if the same person is covering the French or UK edition, the only ones who would most likely even notice this are the very small number who patronize newsstands that carry international editions or people who follow fashion on sites like tFS, and no editor or publisher is going to let that small number be a determining factor. I think that the same person covering different magazines in the same country in the same month is more of a situation to be avoided.