First I painted a base coat. Then I taped off the space I wanted naked or negative. I painted the remaining space with Illamasqua Grab. I'd recommend using a one coater for this part.
After I peeled up the tape, I used a small brush and Barry M Silver Foil to freehand the lines. Other than messing up my pinkie a bit, it turned about really well! It was surprisingly easy to do too!