Eyes & Mouth
The basic eye colour is R37 whereas the white part of the eye needs some shadow too. Here I used the Blender and W3. On top of that I added BV31c for some defined shadow leaving some of the colour underneath visible. After this was finished, I used 202-T (very thin nib) for the darker pupil.
The mouth/tongue is coloured with E07 and 170-T while the shadow was done with the same colours.