When using a stinging cane, and this is generally recommended due to its unparalleled educational effect, a punishment will only be effective if it leaves clearly visible marks, that is, the typical double, strongly reddened bumps. Otherwise it is a deception.
Can't believe I've not commented on this yet. What a beautifully marked bottom I'd have kissed her bottom cheeks better for her, and yes I totally agree all strokes should have been on the bare bottom, not a proper caning if it's not on the bare👀