Adding pictures

Is it possible to add pictures to the map? If so, how do I do this?

You could use the image-tag This is then used on some websites that use OSM-data, e.g. openlinkmap.org or gk.historic.place.
None of the maps on osm.org will show images.
Or do you have something like mapillary.com in mind ?

And openpoimap also has a special layer to show images!