Sorry for crits only but ...
The shading around eyes is wrong. Eyes should be more inside, now they are shaded so they look to come out of the head.
The black outlines inside the head (nose ..) I would remove or replace with lighter outline ('selective outlining').

Generaly: You should not draw 'head', but shape that represents head.

Valeu pela edit cara. Vou ver se tento fazer mais algum depois,  dai tento melhorar a luz, e ver se faço os olhos um pouco mais pertos :)

{ IMO, the eyes are too away from each other... You should try to fix this.
   I did a quick edit, anyway...

   And the light is mirrorzed, your last ones are better illuminated.
   But the color choise on this one is really better.