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I don't have a tutorial to share, but my tip is that tutorials are cool and all but handdrawn tutorials are inevitably lacking. The best thing you can do is grab pictures from /hm/, use photorealistic 3D models and look at muscle and bone diagrams to compare while you pose your own character or reference a picture
There isn't really a single correct way to draw muscle, nipples, penises, etc. if you look at pictures of muscly guys you will notice depending on their fat and muscle levels their nipples just end up in places tutorials often tell you are wrong like pic related, or collarbones get covered by upper chest, or abs just grow in zigzag, penises whose foreskin dont fully retract or that curve or with thick phallus and shit like that