Here is an overview of drawing the muscles of the back (Latissimus Dorsi) 広背筋 and rear thigh muscles (Biceps Femoris) 大腿二頭筋
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and my blog
Ki Creative Studio
https://kicreativestudio.blogspot.com
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Recommended sources
vilppuacademy.com
newmastersacademy - https://www.nma.art/