Well for Ruby I blame the background, she has longer hair and with the pink-ish back ground you can't see if it's Ruby's distinct red-tipped black hair. For Weiss, she's taller then Ruby(which she isn't in the show) and her hair is back with a bow rather then the side.



Not to say there unrecognizable, but I see that and my first though isn't RWBY(well OK my first thought is pretty, but I stand by the point).