Don't always use smudge tool when shading

ALWAYS USE REFERENCES (Such as pose references, give credit)

Flip your canvas when doing lineart (Like not all the time but a few times)

If you feel like you want to alter the colors to your liking, do so.

Have your lineart pen be small (Like a few pixels) and go over a line some times (Maybe like six or seven times, this is the best I can explain it) In my opinion, it makes the lineart look better and more interesting.

Adjust your pen pressure.

Don't delete old art (Cause you can use it for inspiration and/ or to see how far you've grown)