This beautiful scene was created by Brian Miller for his client, REI. They wanted to a snowy mountain landscape which features a tent somewhere in the scene. He used a iPad Pro and the Apple Pencil in combination with the Procreate app for the initial concept sketches. Once they decided on the one they liked better, Brian went off and created a black and white sketch and then later colourised it to create the beautiful scene you see below.
Be sure to check out his work on Behance to see his full process.