Michael Winter's class on "Landscape Extremes" ranged from Monet with a focus on light and colour to the work of Godfrey Miller, who was at the beginning of abstract art in Australia in the mid 20th century. He used a ruler and geometric forms. Some of his paintings took years to do, and even my attempt to use a very simplistic version of his style took a long time!
The first image here is a drawing I made with coloured pencils of a range in the Grampians Mountains in Western Victoria.
The second image is painted in acrylic on a canvas board. It is from a photo of mine of large rocks in Namibia. I enjoyed doing this more than I anticipated but doubt I'll try any more as it is so slow.