Ok, this is a good coloring, not the best I have seen from you. The forehead protector looks off, threw it off for me. If that gets fixed up, it would look much better.
If you are looking for more advanced: the light source shading on the hair looks just right, the eye for pein I think is grey (I don't know) but I think it would look nicer with a gray style approach for the eyes with the same effect (all artists have different styles so it is up to you). Otherwise, I love the shading on the face, it is very professional and smooth. Great work.