User blog comment:Bluegear93/Tali's face./@comment-4237253-20120725203151/@comment-1388547-20120726161749

Well, this was probably a day of work from somebody good with Photoshop (including the time spent finding the photo), rather than multiple days of work by a skilled artist, so they did save time and money. That's the only reason I can think of to do it this way.