>>83654362This isn't really the thread for it so I'm not going to give you a full critique, but you should really aim to get the gesture down before you go into any kind of details. Does that look like a natural pose? Is he squatting or sitting? What's up with his arms? It's good practice to step away from your drawing after you're done with the basic sketch, maybe an hour or even a day. When you look at it again with fresh eyes, a lot of imperfections that you didn't notice before will jump at you. If you go into detail immediately you'll often trap yourself in a situation where your drawing is fundamentally flawed, but once you notice it you have already committed too much to go back.
Once you've laid down a gesture, before you go into details, routinely measure all proportions and fix any problems you might have. However, don't start drawing "correctly" (worrying more about anatomy than about flow), it sucks the life out of your drawing and is something I see a lot from people who studied anatomy but never really went into gesture drawing.
So yeah, look for books and videos on gesture drawing. The anatomy isn't great, but it's passable for now, the real problem is the pose.
Anatomy will come with time as you keep studying, you'll have to accept that you'll have "blind spots" for a while, but the most important thing you should look for are relative proportions, i.e. how long is the forearm compared to the ribcage, how broad are the shoulders compared to the hips, etc. Once you have those down, you can quickly go through your drawing and check proportions by comparing different body parts.
Another important thing to look out for are skeletal landmarks, like the hip bones, the clavicle and so on, which can be seen through the skin. The meaty parts of the body can stretch and deform, but the skeleton will always stay in position and give you a point of reference.
Also learn where muscles connect to the bone.
Welp, kept rambling.
