>>5833464It's not that the sketchy lines cover the mistakes.
It's that your mistakes cover up the correct lines.
Somewhere in the sketchy lines your eye can't see the right line but your mind can feel the right line.
To get closer to the right lines you need to study more anatomy and structure. Once you have the structure down. You will draw the right line/path more often.
Once sketches become clearer over the months/years. A common issue people encounter when they get to that stage is finding the stucture/anatomy makes the drawing really stiff. So to counter that you should study gesture, movement and action of poses. Using straights and curved lines the right way. Stretching and pinching.
From this drawing I'd say the weakest part are your legs. So a good start is to study your leg+feet anatomy.