Are you an artist? NEED FEEDBACK!!

I've been into digital art since I started college, though I don't study anything related to visual arts or graphic design. There are some drawings I did in photoshop during the lockdown and I'd appreciate the feedback of some expert (what should I improve, what to avoid, etc), since I didn't study an artist career or taking courses related with.

Here you can find my artworks: https://www.instagram.com/art_by_daniel_minds/
Thanks