Well, that goes without saying. But it needs to be harder, here it looks too soft and doesn't look like a proper deep throat scene. (imo) Semen from the nose, tears, dick entering full length and the like. It is also desirable to have a face like the one in the basement scene (v4).
P.S. I came across an awesome animation the other day (can't remember if it was from "Fetish Locator" or "Desert Stalker") where a girl is doing a deep throat with her face completely covered in cum, and the cum on her face is animated too. It might have been FL (I'm on my laptop right now, can't look it up for sure). But the thing is, this is the first time I've seen this in the AVN games, and it looks really cool.