Pixies covers work best when the vocalist does not try to do a Black Francis impersonation. There is only one Black Francis, so it is best to make the song your own.
Which Meaghan Smith does extremely well here. From the movie "500 Days of Summer", this video features Ms. Smith riding a bike. And her lips are moving! It's a quiet and subtle reading of a classic song, and not at all like the original. But it still works.
For those who didn't get my "her lips are moving" joke, here is the original video, itself an homage to a Talk Talk video.