I noticed to mayor problems with your drawings. The first is that you often times draw the contour of the figure rather then the gesture. The second one is youre line quality. The line quality thing is easy to fix. simply prioritze quality over quantaty. If you have to think about a line for a cuple of seconds before you make it this is completly fine. It is always preferable to only have one good and confident line that describes the arm rather than 4 hastly drawn ones. Remember even Stans 30 sek poses look like stick figures (with gesture of course) The other issue that you draw the contour rather then the gesture is a lot harder to fix. You might want to rewatch the video but honestly speaking this concept simply needs a lot of practice and I cant think of any good tip to solve this for you.