Creating characters from tv/movies is always really hard. The sims are perfectly symmetrical, and people are not, so they never quite look right. I’d say that for what we have available to us in the sims, you did a pretty darn good job with Orochimaru.
The only thing I can see you doing to “fix” it would be to go into the close up mode and thin the plum out of his jaw, and widen his chin and try to square it off as much as possible. Maybe thin the head itself some. The eyes really aren’t all that far off in my opinion. It’s hard for us to get that sort of angle going for the eyes in game without mods. The skin could be lightened and brightened with an overlay, but that is the closest skin tone without the use of custom content. All around you did a great job! But I understand the slight disappointment when a sim doesn’t turn out exactly right.