Nice studies, Henrique! I love Mike Mattesi's Force series, they're great books! You have some nice gestures here, but you can bring them to the next step if you start to focus on your line quality and control by using some tapered strokes, and ghosting your lines to pre-plan your marks before laying them down. Here are a few free videos on improving line quality, hope they help! 6 Habits for Good Line Quality https://www.proko.com/course-lesson/6-habits-for-good-line-quality/discussions The Tapered Stroke https://www.proko.com/course-lesson/how-to-draw-confident-lines-the-tapered-stroke/discussions