Well I'd have to say that overall I am disappointed in the PF artwork.
Don't get me wrong, it isn't "ugly" or terrible or anything, but it just seems uninspired. I realize that Alien is a dark theme, but I think this PF is too dark and bleak overall. There is a lack of detailed artwork that I was hoping for. There is nothing here to really get excited about or makes you think "wow, that's awesome, I've got to have it!" It's very sparse. Also agree with others that there seems to be too much of a mish mash with differing artistic styles.
Compare this to the reveal of the artwork on the playfield on MET for example. People went crazy over the artwork on that one (and rightfully so).
I do agree with others that it could wind up looking better when it's populated, but I don't think that's going to make a lot of difference. This is a pretty average attempt in my opinion. On a more positive note, I do like the inserts.