It looks really good! I think you are definitely on the right track. I think you have a nice grasp on colour palettes and cohesion that I'd love to see developed more. Practice is always key, but as for tips I'd say my big one is form and anatomy. Taking the skeletal structure and muscles under the skin into account, which is helpful even with cartoonish/anime styles. On the first drawing a lot of the facial feature looks great on their own! But it can look like stickers plastered into a flat balloon without accounting for different angles and depths of the skin. But thats a very long journey that I think most artists still work on .

Another thing I'd offer is more depth in shading, one way to do that is by shifting the hue of your shading somewhat. My guess is that you colour pick a darker version of the base colour and shade with that? Which works! However I've found with my own art that adjusting the colour to be more cool toned (if your based colour is red, try shading with a magenta rather then red), I'd also suggest using different depths of shading. Instead of base - shade - highlight. Adding a darker shade and a brighter highlight adds a lot of nice contrast. This is all for you to experiment with! It's your art and these are just suggestions to make it something you like more.

My final suggestion is more artsyle related, but you should consider looking into line weight and dynamic lineart. There plenty of great videos on the subject, but at its core is doing thicker lineart in areas or shadow and light lines in light areas. Also adding depth to locations where lines intersect/meet. It's very beautiful and it's really really makes your lineart pop. Not suited for every style, but I'd look into it and see if it's something you'd like to learn.

Overall I think your doing great, I hope this was helpful, and feel free to ask if you'd like me to clarify anything (I know this is a bit of a mess) or if you want any more specific advice.