>>7742098
You could work on the shading to give stuff like her shoes more sense of volume and stuff, but honestly... It's a cool style as is. You could employ some comic techniques like making sure images can be read and understood easily (e. g. by making characters stand out by outlining them with a subtle layer of just white paper background so they don't merge with the drawn background etc.) but judging by your panels, you really have a good sense of the atmosphere you want to create. Sure, you can improve on lineart, contrast, clarity, etc. and over the course of getting into realism, you may lose some of that charm, but if you go back to the basics and employ the sense of style and understanding of atmosphere you clearly already have, you'll be just fine.
If you use ink and learn how to hatch to create shadows, you could create more contrast than you can with a grey pencil and it might look more clean too, but it's up to you, there are other traditional tools you can use like graphite watercolour like someone mentioned. Might as well just try things out.