The result is drawn on a diagram, not on your photo
An earlier version overlaid the model's coordinates onto your photo, and when the hand sat at an angle or the background was busy it drew confident-looking lines that had nothing to do with your palm. So the lines now sit at their standard positions from traditional palmistry, and the only thing the model contributes to the drawing is what it genuinely reads well β how developed each line is, shown as the line's length and thickness. It is a picture of the reading, not a tracing of your hand.