Thanks for the additional information.
The map's tile providers can work only with spatial coordinates. To achieve your requirement you will need to convert the 2D coordinates of the images to valid Mercator locations on the map.
Alternatively you can check the RadDiagram
control and see if it would work for your scenario. Using this control you can plot shapes on a 2D surface. Each image from your set could be a different shape on the surface. However, in this case you won't be able to use the Mercator coordinates.
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