Faces are always the hardest things to draw. Eyes/nose/mouths are easy to draw individually, but putting them together with the right face shape and all is a wholeee different story. I don't draw people well, at all. I think I tried a few times but they always looked like 12 year old drawings so MEH!!
And I understand what you mean with the muscle thing. I think that's why I prefer drawing females rather than males xDDDDD. But yeah. I'm sure you'll get there one day!
But I like the shoulder/chest bits though~
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