Now that you have so many sprites, you can chop the bodyparts up into pieces of heads, torsos, legs, hands , bent /straight arms etc ... and keep them on a sheet so you can copy them from it - will save you lot of time, cause you can just copy paste them onto crude animation poses and build on top.
And they will already look nice.
You have some limbs but id do it for all bodyparts, more angles , bent torsos back and forward, various head angles, then you can rotsprite them to get new rotations without much drawing.
Aseprite has built in rotsprite, you can get it as libresprite its opensource.
I start by drawing head /torso front/3/4rd, side, 3/4rsback, and back view, then inbetweens if i need them.
With limbs you can get away with less and just edit them on fly.
Sure sometimes you do need novel angles but most of the time you dont need to modify much after pasting.
Kinda like this but for all bodyparts and angles , and you keep adding novel ones to sheet while you need them.
Like on the pic - al the angles are just rotations of the ones on top with 0 drawing , then you just change shading on the "new" ones so its lit from top like originals , theres no light from the ground up so the one in right bottom corner looks off lit from bottom + the one on left from it.
If light source is consistent its going to look fine.If its not - it will look like cutout puppet.
For diagonal angles of limbs... id make like 3 at various degree angles, 4-5 is best, 2 not enough