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Excellent starts on your goal. The proportions look just fine. On the left figure, the right arm looks a little short and the left arm looks a little big. If the right arm is held away from the viewer and the left arm is held towards the viewer, then they are OK. On the left figure, the left arm is a little long. You are going in the correct direction. Keep up the good work.

Nice job on your overall human proportions of the form, SINE. That's very nicer.

To look into the abdominal muscles for drawing the most, be sure to check out this following link. The reason why is because, you get the most best idea of drawing and cartooning the measurements of those muscles you've got right there above.

Hope it's been completely and totally timely.

Stay healthiest.