>>7679890
I can draw 80 gestural drawings a day easy. When I first started I could do maybe 8 on a good day. And those were wonky as hell. Now I can do a gesture in literally a minute and it still beats anything I did years ago.
By sheer volume and thousands of bad sketches, slowly things came together. That way you also get to develop a method and build confidence in that method.
You have to just grind it out and not get stuck on minute details. Get familiar and study anatomy (muscle and bones), gestures from anything you can learn from and try and apply it to your drawing from imagination.
Your sketch is a good start. Now keep going. Proportions, anatomy all that shit comes with a lot of practise. You just need to put in the hours and expand your visual library that way. Date your drawings so that you can look back at how much you've improved.
Remember: It's a marathon not a sprint.