Animation and imagelayer

So I basically have a character with a blink animation all set, I kinda just want that on a loop at all times and be able to put a layer in top of that to make different expressions so just changing the mouth and eyebrows and leaving the bass layer alone (eyes and general face and hair) so that loop plays all the time, however I can't put a layer on top of an animation. Any help would amazing, im so new to this and can't really find much online without doing something completely new, I'm not trying to make layers with every miniscule thing. Thanks