I think his face is a bit more long and a bit less wide in reality. But who cares? It looks amazing and you definetly got his face expression quite well. It's really really good. I'm sure your friend will be happy and impressed... sorry... lacking of english knowledge to express myself properly haha XD
About your question... I don't have a favourite in the classic series, as I don't really like this one at all. My favourite Star Trek characters are Data, Seven of Nine, Picard and the Doctor from the Voyager because these characters had the strongest characters and/or the biggest developement throught their stories. (The new Picard Series exluded... so many mistakes in one single season... but well, thats another topic)
Worf also made a big developement but... well... since I last watched TNG I like him more than before, but still... he is a clown XD Everyone always says how strong he is as a Klingon, but in the end when it comes to a fight, he doesn't even fight better as the others and looses most of the time XD And I don't like his obsession with the Klingon rituals, just to prove himself to be a Klingon, while he wasn't even raised with these traditions... He should visit counselor Troi more often...