Tutorial: How to Draw Lips - 3/4 View http://rapidfireart.com/2016/10/07/how-to-draw-lips-from-the-34-view/
study of lips by paddy852
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Tutorial: How to Shade Learn shading techniques, tips and tricks for shading realistic portraits.
How To Draw Lips
Okay, MANGA lips are so hard to come by but these aren't manga or anime but gave me some lip ideas ;)
Drawing the lips 3/4 view step by step by Cuong Nguyen https://www.facebook.com/icuong?fref=photo