I've been on a real learning curve, taking a deep dive into en plein air. I LOVE IT! Painting outdoors has become a true teacher, filling my soul with real joy. I'm blessed to live in a region with so much inspiration, like Sedona Arizona.
I have three mentors that I'm learning from and I highly recommend their instruction: Scott L Christensen, Kevin Macpherson and Christine Lashley.
Scott L Christensen: https://www.christensenstudio.com/adventure-of-painting
Kevin Macpherson Books:
Fill Your Oil Paintings with Light & Color by Kevin Macpherson
Landscape Painting Inside and Out by Kevin Macpherson