I could tell the outfit was drawn, it's just that the face and hair and everything look like they could easily be rendered. I would be really disappointed if Raul doesn't end up looking like he does in the pic, because it's just badass. It suits Danny Trejo much more than the earlier pics, too.
Definitely, parts do look rendered. Also, I agree (Strongly) that it fits Trejo better. The Vaquero outfit, sans sombrero, is going to look [censored] bugnuts.
Could be the case. Sounds like it make sense. Maybe rewards from the quest can vary from new, unique, equipment for your companion or for yourself.
Totally. Especially since the pic of the Enclave armor features a pipboy, implying it is the player character wearing it.