I guess, probably just something we notice on a screenshot. But derpys eyebrow are not "MLP style", it might be just your own style (for this eye set), but since your doing it right on the other screenshots I thought I should point it out.
there are bits and pieces I had to construct on my own since I wasn't able to find any good references for some expressions. The eyelids I used in the first episode weren't going to fly since I've added eyelashes to derpys design. when I release the trailer on youtube hopefully I can get even more helpful comments.