some advice?

Abibia, I must say that your quick sketches of those poses are definitely on the right track.

I would like to make a suggestion, and that's your S-curves are not getting enough cartoony and animation-y spirt and bombast. Why don't you please work on your largest and longest lines, through 152 minutes of 29 second quick poses, for 6 days? ( 9120/29/6, 314/6=52 figure quick sketches a day)

The reason why you could do this medium sized but small challenge is because, if you need this for your current goal above, then I encourage you to go on board with this. So, my hat's off to you, and great luck to you.

I highly recommend the book: Force: Dynamic Life Drawing. It taught me everyhting I needed to know about creating movement, gesture, energy and reducing stiffness.