Hm, your art is actually really nice tbh! I think that one thing you might want to change would be your shading methods, tho, and here’s why;
The soft brush tool tends to make the area look muddy, but shading with black and not a color in the mid-range usually doesn’t work too well, unless you’re cel shading!
Instead maybe try out downloading a few blending // painting brushes (which you don’t need to use for painting, and rather shading) and depending on the colors you have, pick blue, green, purple, or pink to shade it! You’ll find that it will be a lot more vibrant~ ^^
Another thing I noticed was that you tend to pillow shade ( shade from all corners, with no visible source of light ), and what i’d do for that is I’d draw out your source of light ( a quick sun or a lamp will do) on a different layer and point it where you want it to go, then draw out guidelines for where it hits the body. Depending on how close or far the light is will be how big or small the shadows are!
Overall, your art is really nice! All you gotta do is some refining!