Acrylic on Board, 11 x 14 inches.  I covered the board surface with two layers of Master’s Touch acrylic gesso.  Using a reference photo of volcanoes that I downloaded from pixabay.com, I made a drawing on the gessoed board.  I then blocked in the sky, mountains, and foreground using the complementary of the colors seen in the image from Pixabay.  The final blue sky was first blocked in using orange; the dark blue of the volcanoes was painted yellow-orange, and so forth into the foreground.

Photo of volcanic mountains downloaded from pixabay.com. All photos on Pixabay are in the public domain, and are free to use as reference photos for paintings, etc.