Pietro Da Cortona, Triumph of the Barberini, ceiling
fresco in the Gran Salone, Palazzo Barberini, Rome , Italy.

My favorite thing about this fresco painting in the view of it. Looking up at a painting gives it a whole new perspective, and Cortona's  use of realism and 3D imagery make the image seem more than just a painting. It appears as though you are actually looking up at an actual event, not just a still image.

Giovanni Battista Gaulli, Triumph of the Name of Jesus, ceiling fresco, Rome, Italy

Just like Pietro Cortona's Triumph of the Berberini, I really like Gionanni Gaulli's Triumph of the Name of Jesus because of the perspective of looking upward at the image. I find the colors brilliant, especially in the center where there is a glimpse of heaven, and I love the 3D effect that this fresco portrays.