Photos can be viewed in the marker description when there is a url provided in the data.  Our sample 1 has an example of this.  The images can also be seen in the description text below the map.

If a url to a photo is present, the “(website) Image” option can be set to use the image.  We do not host images other than marker pins and logos.

Sample marker description with an image
sample marker description with image

Here is a map with an image in the description and below the map: