The annotation is barely readable as your downsizing for this web image is marginal so you might consider replacing it with an image slightly larger. I've annotated one of my own images of all the Minaret locations.
The downsizing is done automatically by summitpost. In the upper right corner, the "sizes" menu gives you options like "orig" and "large", both of which will make the annotations visible. You can also click on the image itself as a shortcut to see the original size version.
Which image did you annotate?