The first step is to draw in the mountain range line on the sky fabric. I drew it in and then stitched on that line. Next I laid the double layer of tulle over the area that I wanted the mountains to be. It was pinned in place to prevent it from moving, which tulle likes to do. Then I stitched around the building tops at the sky line, and then stitched on the mountain line. Lastly I trimmed the excess tulle above and below the stitching lines. And there it is, instant mountain range! I love the color of the sky fabric that you can see through the tulle. It gives it a variable appearance like you would expect from mountains.