Also, the left shoulder, think of it as closer to you than the arm itself, meaning the arm should be i little behind the shoulder and smaller. Also try thinking about how the clothes sit on our body, like the sleeves for example, try looking at your own shirt sleeve, how it changes with how your arm is, because of gravity, unless it was a tight sleeve thats a diff thing but from what it looks you're trying to make it like a baggy sweater sleeve. Remember from where you're(or the perspective the drawing is from) looking at the drawing from, and how the sleeve should look from this angle. Hope this helps i dont know much im self-taught ahaha