Hmmm... Look for some more references for anatomy, practice them, and u could use clipping group to paint lineart.

good idea! thank you :)

hmmmm okay i have four things!

shadows aren't always the go to: sometimes you can do what steven universe does and use dynamic colour pallets depending on the environment. (i haven't done this myself yet but someday i should since i suck at shading)

experiment with line thickness: thinner line weights here and there, thicker ones also, you get the idea. get fun with it! one bit of this advice i hear a lot is kinda thick outline to make the drawing pop and gradually using thinner lines on the inside.

and lastly: try out a ton of body types. it's not really an issue or anything but it is advice that helped me a lot.
senōr kensington is naturally built and that rocks, and there's only two other OCs introduced as of now. but don't be afraid to experiment. look up lineups of types of athletes with different body types for references! ("olympic athletes different body types" leads you right to a super helpful one)

i considered advice for posing but you're pretty good at that already!
sooo yeah hiss on!

wow thanks for the very detailed advice! i'll certainly give it a shot <3

I think, look those you think are nice artist, try to copy their features in your style, use references and keep going, and without stressing yourself over it.
you'll improve for sure

thank you! thats a good idea :)

Honestly, YouTube is full of amazing tutorials. Watching an artist create something in real time really helped me understand how they break complex forms down into simple shapes. Here are a few of the tutorials that live rent free in my head...

Todd Nauck Draws Harley Quinn Part 1 of 3

Don Bluth Draws Kimberly from Space Ace

The Loomis Method by ProkoTV