I think just draw a single thing black line down the front of either leg.
That should show that they are legs but also keep the minimalist shading feeling.
You could also then invert it the picture and it would look like a Frank Miller image
(
Jeru War and Piss,
Mon 27 Apr 2009, 21:55,
archived)
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Stocking seams.
(
Richy_T hundreds if not thousands of dollars,
Mon 27 Apr 2009, 22:37,
archived)