Put a photo on the screen, fade it down, and draw over it. Because the reference is faded, your own strokes stand out — and you end up with a drawing that has the proportions of the photo. Tracing paper, digitally. Load any photo from your gallery and draw straight over it. An opacity slider balances the reference against your own lines, so you can fade the photo back as your drawing takes shape. Switch on the camera and the live view sits behind your canvas.