blocked in the front of the face.
blocked in the back
Went in with burnt umber for shadows and veinwork
Deepened the veins with blue.
Mottled the front of the face to darken the tone.
Added white to the front and back to add depth and detail.
Darkened the red in the face.
Darkened the back
Eyes started base yellow
blue green veinwork
Here are some finished pics of the two aliens.