Vast open spaces in a small sketch book

I was recently out west, where Idaho - Wyoming - Montana meet.  This area has vast open plains, tall craggy mountains, brilliant blue skies and many beautiful rivers.  I spent most of my time fly fishing in Yellowstone National Park, but also was able to tour some of the attractions at Yellowstone National Park and Grand Tetons National Park.

Below is a sketch I did of the distant hills, after spending the day fly fishing the Gallatin River, Yellowstone NP.  Like many rivers, this one begins in the mountains and is formed by rain, snow melt that flows into small creeks.  We were fishing in the valley where the now wider river begins to meander.  The banks of this swift flowing rocky river are lined with dense willows.  I was told that moose like to bed down among the willows, but happily we didn't run into any while we were fishing.  The coolness of the water was a refreshing complement to the sunny warm day.