Can I add pictures for a specific point?

OpenStreetMap is not a database over pictures. However flickr have support for osm tags to link your flickr image to any osm object.

Besides the mentioned tags there are also sister projects like OpenStreetView and OpenStreetPhoto that try to create a photo database with corresponding coordinates and show them on a OSM map.

There is a proposed feature image: https://wiki.openstreetmap.org/wiki/Image

but images can only be linked from an external site, not uploaded to osm. Osm is a map and not a photo album, anyway ;)

You can in the JOSM editor this will give details https://wiki.openstreetmap.org/wiki/JOSM/Plugins/Photo_Geotagging but I don't know of a way in the map page