Greatest job on your 10 second thumbnail poses, but I'm still not getting enough of the most grotesque caricatures in the attitudes. How would you like to please free up your lines of action and rhythm with 7 second pose drawings? The reason why is because as mention in the last two comments, it's to make your thumbnails the least stiffest and the most exaggerated and spontaneous. For most info and details, please look into this link on Disney gestures here!
Good luck to you and have the greatest evening.