Just your beautiful Flickr photos. In a Justified Grid.
Yes, use the shortcode attributes called
user_id. For example the shortcode
[flickr_photostream user_id="67681714@N03"] displays the photostream of the specified user, no matter what is the default user ID specified in the settings.
Yes, of course. But remember that the cache (and also Flickr) doesn't allow to see the changes immediately.
Probably because they aren’t public: Flickr Photostream can’t show private photos.
There could be many reasons.