One problem is that in the movie, WALL-E's eyebrow doesn't pivot the way I've designed mine. The real WALL-E's eyebrows slides upwards slightly and then pivots outwards. It's difficult to explain so check the movie to see what I'm talking about.
I still have to create the inside piece of the eyebrow - where it will rest on. The internal mechanisms are almost done but I was too lazy to create a section view to show them... maybe next time. I also have to update the design of the eyebrow to make it look like two links.. next time as well!