Until someone gives you some shots, you can actually see them used in the Dreaming Cave under the Ceporah Tower iirc. The merchant near Artaeum wayshrine sells the praxis for those I think.
(Not sure about the Painting, it might actually be the same one that you can get from the artists' quest chain in Summerset as a quest reward. There's a whole bunch of Summerset paintings so I don't know if it's the same one)