Confident long curve strokes not able to achieve, lines looks staggered. I used 4B thick less sharp tip pencil, drawn lines with Overhand grip position, instead loose sketch, looks thick lines. How to get confident lines. But with multiple initial very light lines and over that dark one line able to achieve clean stroke, clean stroke not with one sweep.
It felt uneasy with Proportion & Perspective, initially light laying with basic shapes construction felt easy solving above problems. Tried best to bring down details to simple CSI, this approach helped capture gesture,action of subject. There is issue getting improved Line quality and area where to darken lighten the line.