Art resources for the prospective drawfren:

Hampton Figure Drawing Design and Invention:
https://anatomiaartistica.files.wordpress.com/2014/09/michael-hampton-figure-drawing-design-and-invention-1.pdf

Fun with a Pencil:
https://www.alexhays.com/loomis/Andrew%20Loomis%20-%20Fun%20WIth%20a%20Pencil.pdf

Drawing Comics the Marvel Way:
https://ia800801.us.archive.org/24/items/DrawingComicsTheMarvelWay/Drawing%20Comics%20the%20Marvel%20Way.pdf

Figure Drawing for All It's Worth:
https://illustrationage.files.wordpress.com/2013/04/andrew-loomis-figure-drawing-for-all-its-worth.pdf

Pixel Logic (for pixel artists!):
https://oiipdf.com/pixel-logic-a-guide-to-pixel-art

YO! These resources SUCK/I've read these already!
Google is your friend, my good anon. This is a small, yet rudimentary list aimed for beginner drawfrens, but there are countless resources/communities across the internet that you can use to continue to improve your skills. GANBATTE, ANON!