Follow directions on paint pen to get paint flowing.
Tape any areas where your lines may hit the other walls and counters. Small pieces of tape will work just fine.
As lightly as you can, draw on the wall with a pencil.
Step away from the wall periodically and look at the sketch from a distance. When looking up close for a while it is hard to see what it really will feel like in the space.
Use the paint marker to go over your designs with thin lines to start. Continue to work on your lines by making some thicker than others. Make sure to hold the marker as close to 90° for the smoothest application.
Let the paint pen fully dry.
Use a good eraser to get rid of extra pencil lines.
If needed, add a little wall color to a foam brush to clean any smudges or imperfections.