One of the challenge in painting imagination landscape is reference photo. You have to collage different references into one big picture in mind. Then I came up with this step: create a landscape study, just black and white, for reference and stress reduction because I don't have to challenge my brain to memorized every detail, light and shadow.
PS: You're invited to join my Collector's Circle, a mailing list, to receive update of new releases. Go to my WEBSITE, link in my profile, then go to CONTACT in main menu and click on NEWSLETTER.