This is a cute expression you've made for Luna . I see you incorporated shadows into the picture, how you outlined the face in a darker shade makes the light source seem to be coming point face on. I would suggest practicing this shading technique. Look around deviantart for tutorials on complex shading and light sources to improve your work. Adding two or three more shades of a darker color around the face will add a more realistic feel to it (the more layers the better). Once again the lining seems a bit choppy and I can nee little bits of lines around the mane that were not erased and lines that overlap like around the ears which can be fixed up with an eraser. However, overall the picture seems to show your improvement of technique.