Their drawing, not ours. The picture is flattened for uneven light, the ink separated from the paper, dust and the page's border dropped — and that's all. The traced outline follows the pen at about a tenth of a millimetre; nothing is smoothed into a shape it wasn't. What a printer can't make — a line thinner than two nozzle widths at the size you chose — is left out and counted, so pick a bigger size to keep the finest strokes. The confidence line says how well the photo traced and why; a low one means a better photo, not a worse keepsake.