CGI stands for Computer Generated Imagery, normally it means generating images with a 3D program - which is NOT what Ciro does, he draws and paints, by hand, on a graphic tablet.
Personally, I'm not a fan of imagery done with programs like Poser, but that is just my personal preference.
There are awesome collage decks ... I still love Arnell Ando's Transformational Tarot, for example. With the Victoria Regina (not Romantic!) or MRP decks, the images used have been altered and developed so much, I'm not sure if I would even call it collage anymore.
I know horrible hand painted decks and breathtakingly beautiful ones.
I don't have any artistic training, and to be quite frank, with some of the commercially produced decks I find it hard to determine which technique was actually used ... digital collage, paper scraps glued on paper? Digitally enhanced sketches? Stock photography painted over? I have no idea, and I don't really care. I think I can probably distinguish between professional level and amateur art ... and yet I own a few completely amateurish decks, amateurishly produced, which have tremendous charm AND maybe even pushed the Tarot envelope for me.
And I can't separate the medium from the imagery when it comes to Tarot, because Tarot itself is a medium for me - and as such, it needs to work for me, which most of the time wins over the artistic merit.
ETA: Ciro posted very much the same while I was busy typing this