I did more studies. Kind constructive criticism is welcome :D

Hello~! This is my first time posting a drawing. I made quick sketches of stomach-to-leg poses. Each was made for random 5-9 mins. timeframe. I think I did a mistake on the thigh of the one with the pompoms and the hip part of the one below it. But wanted to see if I committed more mistakes. I would still like to ask for gentle constructive criticism on this for further improvement. :D (Unfortunately, I wasn't able to save the image references, and most of the outfits are invented. All feedbacks are appreciated!).