I saw a painting in our hotel have a similar effect like this one. Once, I arrived at this location, lucky enough it was a cloudy day, and I waited until the clouds covered the foreground. Then I try the following method. This shot it was on long exposures with no filter. Since the foreground covered with the clouds, so I intensional made the background blownout. Beleive me it wasn't hard at all, but it looks ugly in color.
After a long horseback riding in Jackson Hole. On our way back to the highway, this is what I found after I made a wrong turn. I did not like the background on this picture, so painted black. I hope you like it!