Martin Scorsese says Marvel movies are "not cinema"

[Alan V]

Yes, I certainly agree.  But I see very little chance that such a painting will still be considered worth anything in the long run.  In the long-term, even the critics get sorted out.

I hear you. I've always found the world of painting fascinating. Can you recommend a course or a book I could try?

If you are looking for something which is a general introduction that doesn't go into overwhelming detail, I could recommend the book 50 Paintings You Should Know.  However, since that includes both religious art and modern art which you wouldn't likely appreciate, it might be better for you to find a good book on a specific artist whose work you enjoy, and go from there.