Criticism

What I love about Clint Eastwood is that he doesn't over-intellectualize his technique of filmmaking. He just does it.
If you like it, you like it. He doesn't need prizes.
He has afforded the right to shrug off so much vitriol based on his politics. He put Spike Lee in his place.
So, it goes without saying that his advice and wisdom passed to him would feel comforting for anyone trying to make anything.
Over analytics KILL your movie.
That's right. We sit around vamping for too long about what everything means means you choke the fuck out of the essence and emotion of a movie. Something he learned from the great (and grossly underrated director Don Siegel).
The other thing...taking yourself too seriously.
I know in a lot of cases a TON of money is involved. So it's a big gamble. Stress will blind you to the love of making movies in the first place.

Also silence. Silence in our business means...death. Many times when someone doesn't get back to you, or doesn't respond, it means you're off the radar. Should you take this personally? Probably not. But you can't help it. The voices in your head that convince you to be better and that you aren't so good or the combination of what was put together doesn't work falls on...silence. It's deadly because you conjure up your own self-evaluation. And that's never pretty.

Jeff Daniels has an amazing interview on Sam Jones' podcast which I beg every actor to listen to. It applies to filmmakers as well. The gist is...make the project and move on. He is an incredibly thoughtful person who evaluates himself enough to realize that being a solid actor beats being a complete self-aggrandizing douchebag that gets buried in the Hollywood machine (Chris Pratt). It's humbling and reassuring to know making anything and content to make it to your best ability is the best reward despite colleagues or industry's critique.
A great listen all around.