Oh yes, the private photos shouldn't be viewed in that way, Grace, you're perfectly right.
The public ones, though, should be viewed as propaganda because that is what they were, undoubtedly- the Tsar carefully orchestrated how he wanted himself and his family to be viewed to the public. In the shots of the family together, they are largely informally dressed and standing/sitting in a manner that shows their closeness. The Tsar is usually, if not always, at the centre- the core of his family, the 'father figure' that he is both literally for his family, and figuratively for his people. The photos express a familial love and a sense of being regal and elegant but also down to earth- they are the rulers of Russia, but they're also not so dissimilar from their people. They are accessible to their people, but they are also separated by their rank; a picture tells a thousand words, after all.
The private photographs were not meant for public consumption, no, and this is evident in them. They are family snapshots, unposed, etc, ones we all have at home. We can't really read any propagandist intentions into them, because if it were not for their untimely deaths, I am sure they would not have been published in their entirety as they have been. I'm sure Nicholas, Alexandra and their children would have been mortified to think that so many people can see their photos now! I know I would be!
Rachel
xx