Art and its practice is similar to that of a sport. It requires the development of muscle memory and the sport theory. Most who start out will have coaches and mentors and heroes. And if not immediately available, seek them out the way you have with the Proko class.
These mentors will shape the way that you understand the fundamentals of drawing, value, edge, and color. Not to mention how you apply them (the tool of choice), and in what order.
You can find your style and learn shape language and mood over time and repetition. 'Online Critique' can help you learn what it is you might be missing since you are doing it by yourself. But...depending on the critic, the observation might be subjective and personal, or objective.
The way you word your posts will help the rando internet critic be more objective. Your needs. Your unknown next step. A lot of posts that are very general, like "any critique welcome", require the expertise of someone more seasoned who can see your personal progress, and judge what advice you are ready to absorb next. However, more specific requests can help many more people state their opinions and observations more bravely. But it will usually sound more complimentary. "I love your studies haha!" That sort of thing.
I usually have to ask people to post the reference along with the study. You are not selling it for profit and are sharing the work in an academic capacity. Please share away.
Critique
Since you are doing this digitally, see if you can resize your drawing, and/or your reference to a 1:1 ratio side by side. (Same size) This will help use see how different the attempt was. But that might be for future sight size studies and not tracings like this.
See if you can slow down and make more confidant sketch lines. To make that easier for the shapes, mark the angle. The landmarks I mentioned before line up horizontally for each bone mass of the torso.
Head:
Brown Line,
Ears,
Cheek Bone,
Nose,
Jawline
Side Plane
Top Plane
Ribcage:
acromion process,
collar bones,
tenth ribs,
Hip Bowl:
Iliac crests,
greater trocanters.
Sacrum
Example: (open in new tab)
When you get lost. Just focus on the height, width and center of every mass of the torso. Front and rear. That will help you with perspective. That is what you will do when you use sight size when using 'figure drawing' theory for short poses not drawing the underlying anatomy first.
If you can draw simple mannequinization shapes all the way through can find the forward/rear tilt of the form (rib egg, hip bowl) you are well on your way. I Notice the correct perspective and shape on your drawing in the example, but then the anatomy breaks down and gets lost in perspective.