Currently the sketch looks much better than the final drawing.
This is because the structure you gave it with the sketch vanished in the final illustration.
But also the sketch has some beginner mistakes, like to wide shoulders, a too big head, too long arms, to long torso etc.
TO get this right it's crucial to work a lot from reference first and get how proportions have to look in you.
The most effective step to practice that is to practice the first 2 steps.
This is also what I'd recommend you to practice.
All the anatomy builds on that.
