Try making the cats' ears, bangs, and head fur bob up and down a little bit (redrawing them to make it look more natural, instead of looking like you just used the select tool and nudged it down), as well as making their necklaces move back and fourth a bit, it will make the animation look more fluent and realistic-ish. If you bob your head up and down while looking in a mirror, your hair would move. If it didn't, it would seem odd. You don't have to listen to me at all, it is only a suggestion.
I actually do all of these things when im legitimately animation, but the point of the bobbing journal dills is just select and nudge the head and wag the tail. If they want other movement thats a whole other commission ^^