See reference photos attached as a download. Full demo video posted in next tab.
Materials: 8x10" horizontal oill panel. See supply list for my oil colors frequently used (warm and cool of each primary plus white). No special colors needed. Assorted brushes in sizes 2-8 (mostly Rosemary Ivory Long Flats).
Siena Hills Reference Photo is primary reference with Tuscan Hills as secondary reference. Note the sketches which were done mostly from the Siena photo. 3 is the least interesting and 1, 5, and 6 have potential!
Use this video for inspiration to try sketching ideas about your own photos (or plein air location).
Embrace the idea of unity yet variety, or have no equal intervals as you sketch.