i recommend that you draw more frames for actions. it will get really repetitive but that's the fun part about animation! just kidding, but i advise that each action should have more frames to convey it's own emotion. you can even cut down on lip syncing if you are able to get them in a pose that doesnt show the mouth. give your characters more actions and make them more lively, you will be a wonderful animator! i look forwards to seeing your next animation. have fun and keep animating!