I agree that it's not terrible, but the good news is that's there's a lot of room for improvement and to get better.
The biggest thing I see is that you're kind of folding like an accordion. You really need to get your knees out more. Think of your hips being slung in between your legs. Pick one or two or these cues that often helps:
-screw your feet into the floor
-spread the floor with your feet
-push your knees outs
This will also help keep your knees from going so far forward and help you stay more upright.
You might want to sit back some more. I'd at least learn how to do it and decide if you want go with it or not. Right now, you don't sit back much at all. That's not necessarily wrong, but you are on the far end of the spectrum in that regard. It's just something to think about.
Be sure to arch your upper back hard and keep it super tight. I think you might find it easier to do if you pull your elbows down and forward some. If this irritates your wrist, elbows, and/or shoulders just widen your grip some and maybe start doing some mobility work.