@john-black,
It is not possible to add an image on the datapoint of the chart as of now. However, you can add Unicode characters to the indexLabel and place them inside the datapoint by setting indexLabelPlacement property as inside.
Kindly take a look at this updated JSFiddle for an example on adding Unicode characters to the indexLabel.
At the same time, you can show image on the tooltip. Please refer to this JSFiddle for an example on the same.
—
Adithya Menon
Team CanvasJS
