Again, good scans. Here are a couple of points I would like to mention, without wanting to offend you.
Navas; The forehead (top of the head) looks too small. When applying it to the game, it might not work.
You need to get rid of the white blobs on his nose and maybe the small white bits next to his eyes.
Muniesa; Try to avoid making scans where the mouth is open. Just 'smudge' or 'blend' the lips together and the game will separate them for you.
Again, I only want to help. Keep up the good work