Hi Antonio,
Thought I would chime again, since I am working on the same subject. I think the mouth is down too far. To me, there may be too much space between the nose and upper lip, and not enough between the lower lip and chin. Or it could be that the chin itself is too short and need to be a little bulkier/rounder and longer. Also, I think the mouth looks a bit puckered, as if he's purposely pushing his lips out, especially the upper lip. The last thing is that on the lower eyelids, I think they should be smooth, not wrinkly. He does have pronounced lower eyelids, but they aren't like an older persons that would be loose and wrinkled, his are basically smooth and firm. Overall I think you are doing great and are on the right track, I wish I could get mine this close