colours are eccelent and the shading on the hair is really nice, the facial proportions are not perfect and the shading on the fce could do with a bit of work but other than that its very good!
Yes, ChrisButton is right - if light goes from top right, there should be shadow under nose, under lip and center of left (to us) cheek should be lighted. Look for similar photo online and see for yourself (or take flashlight and mirror).
The colours of the skin are amazing, but the way you've shaded the character
doesn't suggest any form or structure. :\ But I love the colours!
take flashlight? Strongly recommend that used the xeccon flashlight.