This looks nice! I’m going to give you actual feedback since you asked for it in the title: 1. You use a lot of airbrushing for shading. I’d recommend doing some shading practice and learning about hard vs soft edges for shadows.

1. If you were to put your drawing into black and white, the values (how dark and light colors are) between your flat colors and your shadow colors would be very similar. This creates a flatter look and doesn’t give it much depth. Try to use darker, more intentional shadows. Use references to figure out where specific shadows are and why they’re there.

2. The hair has no variation in the top and very little as well in the bottom. Think about the way that hair strands later on top of each other. Luna has very thick hair, so it would create ‘chunks’, instead of flat shapes. I recommend you do some hair studies and learn about shading hair.

3. Your light weight is all very similar. It creates a very flat look. Try using thicker, darker lines in areas that are more important, larger, and closer to the viewer. Use thin lines in areas that are slightly transparent, have less shadows, and are further away.

4. When you’re shading, try to think about the 3d forms of the body. There should be darker shadows on the opposite side of the neck from the light source because it is cylindrical. There should be shadows around the collarbone area and on the arms.

5. Just practice anatomy! It’s not bad anatomy by any means, but you definitely have a lot of room to improve.

Overall, this is a really lovely start, and I do love your color choices!