Mine is easy. But I won’t share in case it comes off as spam since she is my wife :p
My favourite artist is William Adolphe Bouguereau. Brilliant artist. My favourite painting is Starry Night Over the Rhone - Van Gogh.
Huge second for Van Gogh’s Starry Night. To spice it up a bit, my fave contemporary artist is Alex Grey
If considering an artist’s whole career, I have to give it to Bernini. I have a soft spot for polymaths, and his sculptures in particular are still outstanding to this day.
My favourite single piece is this Roman bust, currently in the Hermitage, by an unknown artist (I guess I have a thing for realistic busts?) https://pbs.twimg.com/media/ExlzPDDWgAAXudy?format=jpg&name=4096x4096
That was a fun rabbit hole to go down. Thanks!
I remembered the name from Art History, but uni was so long ago it might as well be ancient history itself :)