This is the same valley in the Rocky Mountains seen in this post a couple of weeks ago. The brown is walnut ink from a fountain pen, which is not waterproof and in some places I used a wet brush to blend it. The black is from a Micron brush pen.
Mostly I just started drawing this to try out the combination of tools. I haven’t used this brush pen for a long time and wanted practice making something with the tools that I’m planning on taking on a trip. It was kind of tedious doing all of the shading though. Getting some grey ink might have been better than crosshatching with the very tip of the brush pen.