I like it, and would definitely be interested in seeing what you can do with respect to curly more realistic hair and/or greying! (edit: sorry, I think I misread your post re:hair mesh on the first pass) But one thing I like about Cullen's vanilla stubble is that it seems to be thicker in the same shape around his mouth and nose as his old goatee (which is also how my husband's grows, which makes it seem more realistic to me I guess?), and it looks pretty uniform here. I've never dated someone with more beard than in-game Cullen, and it's never occurred to me to look closely at strangers' stubble, so I have no idea if it generally does even out that quickly or not; just a thought.
(also seeing as you seem to have successfully modified his facial hair without making him look weirdly smooth like those mods generally do... if you ever happen to make one with aforementioned DA2 goatee, that would be rad as hell)
THIS HAS BEEN: weirdly specific stubble commentary with Owlfruit! tune in next week for a discussion of chirality and sweat.
He looks good to me (not hard to accomplish lol ) but that looks plenty, but maybe a little more from the center of his chin to his bottom lip? If thats doable and you want to of course 
I like the amount of scruff in that one. And I don't think anyone would be surprised that I like mods, etc. that age some of the NPCs a little

I'm normally a beard fan, but I've had mixed reactions to attempts to add a full beard to Cullen. I mean, they're very well-done, I just somehow don't like him as well with a beard. A fuller goatee, though...?
Thanks for the feedback guys. I will play around with it a bit more and see what I get. I'm not sure if I can get a DA2-style goatee because I built this off adding to his already existent facial hair - unless I can somehow patch in different skin without hair (I can try to see if I can merge his texture with someone who has nice shaved skin). I can definitely do a "poorly maintained" goatee that has grown in a little bit. Honestly, that seems like it would be a bit more realistic anyways since I'm sure he's not maintaining a beautiful man-scape from day to day. I can imagine him rocking the "mountain man" look.
My b/f has to use his razor/shaver/man-scaper thingamagig like every day to keep his facial hair lines crisp. If he were to go off to war I can only imagine what his face would look like. 
So if you DA2 fans would like to see my take on "Cullen's meticulously maintained goatee goes off to war" then I can give it a shot!
I would never dream of touching the lip scar, but what other stuff would you weathered/rugged/older Cullen fans like to see? I don't want to change his face too much because honestly it's good the way it is. I'd like to keep it classy!
*edit*
As an addition to the "male facial hair growth patterns" discussion, my b/f's tends to grow in quickly along his jawline and chin, but would never be able to grow a goatee, so I guess they're all different!