I wonder if it would help you to draw a larger version. It seems like it would be hard to be really accurate (at least when starting out).

nice. You could also use a circle to find the lips. The whole mouth is not a flat area, but it is convex.

Very helpful

Nice! I think you did a good job capturing the position of the bean! - I would be extra mindful about the proportions of the torso: the upper part is taller than the lower part. The hips are of equal width to the ribcage in a male. In a female the hips are wider than the ribcage. - Sometimes I feel like the middle mass between the ribcage and pelvis is undefined. Rather than two parts, it might help to think of the bean as three parts. Two modified balls for the ribcage and hip, and a mass inbetween. - Think about how you can use line weight to communicate things such as force, overlaps and form. Stan talks about line weight in this video Line Weight Hope this helps :)