Aaah thanks! Sorry for the late reply; I'm usually inactive in DeviantArt though; I'm more active in Twitter/Tumblr/Discord. :0
Although I can't give constructive criticism in all of your works (I am usually busy nowadays), I can say that your artwork's really good, probably even better than mine since I'm not much of a digital arts person. To try to get better though, keep practicing and look through references! By practicing, I mean sketching from life, drawing poses, etc. Also don't be afraid to experiment new things; that's how you expand your visual library.
I can be really bad at explaining things, so I'll leave you with a compilation of tutorials that I saved on Tumblr: peppermlntsoda.tumblr.com/tagg…
. I've also favorited a bunch of tutorials that I saved in the Tutorials folder, so you can check those out too!