Hi Lysa,
Thanks for using Syncfusion products.
In our SfChart, currently we don’t have support to use icon as DataMarker. But, we can achieve your requirement by using ValueToPoint method which in avail in SfChart.
We have prepared a sample based on requirement. Please download the sample from the following location.
Sample: DataMarkerIcon
Please let us know if you require further assistance on this.
Thanks,
Manivannan.E