Everyone knows that when it comes to all things Las Vegas, it ain't cheap. I can't find a single better example than the Bellagio Gallery of Fine Art. Yes, it might be fine, but there's no reason to pay a hefty fine to see some 25 or 30 pieces of art. It costs $15 for non locals and $10 for students. Yes, they do have works from Picasso and that fact alone saved this review from being demoted to a single star.
Save your money and go to the Richard MacDonald gallery of art based on his sculptures of Cirque du Soliel. Ironically, there are more works here and they are insanely detailed and quite amazing.
Oh, and this gallery is also free.