That looks really great! I love how the colors go well together. You picked a nice color scheme.
As for tips, I recommend adding some more shading and highlighting. Maybe try to get rid of the white areas around the line art. Using different line weights (thicker and thinner) can look nice, too. Don’t be afraid to use a reference for shading and other stuff or experiment with new techniques. You’re doing great! Keep up the amazing work! It’s looking really good. I hope this helps!
You don’t have to take any of my advice, feel free to leave it if you don’t agree 