Reason: Cocked* is a more succinct and natural description of the expressions. We could also do the reverse, but an alias one way or the other would make sense.
I think raised_eyebrow is as commonly used as saying the eyebrow is cocked, so I think what we're currently using is better.
For the head though, I think "cocked" is the better choice. I think when the word tilt is used with head, it is commonly referring to tilting the head back. Cocked on the other had is pretty much always used to refer to having ones head cocked to the side.