Mount Maunganui professional artist Rob McGregor has 10 short free painting lessons available on YouTube for learners who are starting out:

Lesson 1: Painting perspective techniques with Rob McGregor – Part 1
Lesson 2: Painting perspective techniques with Rob McGregor – Part 2
Lesson 3: Painting perspective techniques with Rob McGregor – Part 3
Lesson 4: Easy approach to perspective: drawing or painting
Lesson 5: How to use light direction, intensity and colour in paintings
Lesson 6: Easy way to Paint Mountains
Lesson 7: How to shape hills and make some look further away
Lesson 8: Easy way to paint clouds
Lesson 9: What makes a good composition?
Lesson 10: How to mix a wide range of colours

He still tutors or mentors a few art courses for adults and enjoys working on commissioned pieces.