Nicest job on your range of the lightest and loosest lines of action and rhythm, hey_amine. Very greatest job indeed. Yet still, I'm not totally getting enough of the loosest and lightest lines of action yet in terms of forces, spaces and forms. How would like to free up your dominant hand with 1 hour of 1 minute 55 second quickest pose sketches? (3600s/115s=about 31 quickest and loosest line poses)
115 x 3=345 360-345=15 150-115=32
The explanation behind this littlest bit of critique is as a result, your lines will become the most lightest and loosest in your shapes and spaces and forms, which could and would be your next goal, then bring it on. For even most inspiration, please look into the Bridgman Life Drawing book online at Amazon here.
My hat's off to you, and may this have been totally helpful and practical.