I would recommend that you make sure to stick to one size of the drawing because right now borders of it jump all over the place which distracts us from actual frames.
Also consistency. Guy appears to be taller when you look at him from behind, hat grows bigger even the background changes a bit.
If your goal is to make animations later on you should learn consistency and to make the movement smoother. Unless you're going to go for a disturbing vibe- everyone have difference preferences.
Anyway. Good luck.