User blog comment:The Bespectacled Guy/General RWBY Stuff 1/@comment-7497475-20130827005814/@comment-11188061-20130827045829

Well it's not really an inconsistency but a design choice. After all given the constraints they have adding colors simply means more time wasted on perfecting models, so they decided to fix the silhouettes as a unique traits that symbolizes strangers instead.

Though I'm sure they'll refined it as you've mentioned by adding different depths of shades and some light coloring in the Blue Rays. Speaking of which, when will those come again? Next year?