What I've found helpful is:
How to draw by Scott Robertson https://www.amazon.com/How-Draw-sketching-environments-imagi...
Dynamic Bible by Peter Han https://www.amazon.com/Dynamic-Bible-Peter-Han/dp/B07NFDXSKJ
And to loosen up:
Vilppu Drawing Manual by Glen Vilppu https://www.amazon.com.au/Vilppu-Drawing-Manual-Glenn/dp/189...
There's others on drafting like Mike Mattesi, Steve Huston, Bridgman and Loomis. Once you 'get it', the best thing to do is to draw from life a lot.
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What I've found helpful is:
How to draw by Scott Robertson https://www.amazon.com/How-Draw-sketching-environments-imagi...
Dynamic Bible by Peter Han https://www.amazon.com/Dynamic-Bible-Peter-Han/dp/B07NFDXSKJ
And to loosen up:
Vilppu Drawing Manual by Glen Vilppu https://www.amazon.com.au/Vilppu-Drawing-Manual-Glenn/dp/189...
There's others on drafting like Mike Mattesi, Steve Huston, Bridgman and Loomis. Once you 'get it', the best thing to do is to draw from life a lot.