I think at some point Riven will meet with Fiora and will be great allies as they seek to regain his honor. Fiora wants to regain the family honor, Riven wants to regain the honor of the nation why fight, so no wonder they feel very common one another. Who says this is a future for Riven skin as the ally of Noxus in demecia garb.
I love your artwork. Everything is crisp, clean and eloquently presented if art spoke its thousand words, but I must say: this does not say "Riven" in so many words. It says much, and speaks to me of art well done, but while I can easily imagine Riven as a musketeer, fighting against the odds as an exile, this makes me wonder why a musketeer has white hair, instead of saying "Holy crap! Musketeer Riven!" It's not the sword that defines Riven so much as the attitude behind it.