Noble Knob is a landmark in Washington state that I photographed to create this piece. I have reduced this down from 40 colors to a more managable 25. 10 of these are found in the sky, meaning this could be reasonably transformed into a 16 color piece. However, I find that I don't much like the result and prefer the higher color count. 

Photo link - https://i.imgur.com/tqfg7Nl.jpg