Great topic - thanks for starting it @MC Prussian
I think I've yet to find an artist/painting that I would consider to be a favourite. I suppose that is half the point of art - it evolves and you evolve. I have spent a fair amount of time in galleries, and one of the (increasingly few) benefits of living in and around London is easy access to some pretty cool exhibitions.
In my 20's I was a little obsessed with Van Gogh and Dali - and managed to see a few works on my travels. Then I thought it might all be a bit twee and I was being duped by hype. But 30's, 40's and beyond bring different perspectives.
So I visited some lesser known artists works that were (imo) a bit shite. But I looked at them in a vaguely frowny, critical manner that I assumed showed that I knew what I was looking at.
And many many years on I still have no clue. I am massively impressed with some of the above works and the descriptions/feeling they invoke. On our wall at home we have a couple of copies of Modigliani paintings, a cool graffiti art pastiche of a Mondrian, some scenic originals from local artists and an artists proof of a Rolf Harris that I'm not entirely sure what to do with
I do, however, always come back to...