Antonina, thanks for the last icon, interesting. The iconograph probably wanted to show the "passion bearing" aspect of Tsar Nikolaï, perhaps making a parallel with Job.
As for the icon of GD Serguey Alexandrovich: there are people nowadays who are ready to canonize every imperial person who suffer more or less and - before all - represent authority, autocratism, strong Russia and strong Empire. They paint icons of Ivan the Terrible, of Paul I, of Serguey Alexandrovitch, of Stalin (yes!), of Rasputin... This icon is not canonical at the moment. Near Sergey Alexandrovich'grave, in Moscow, there is no icon, only a photograph and an icon of Elisabeth Feodorovna.
I really like the icon of the four grand-duchesses posted by Bod. A big thank you. It is really beautiful and fully follow the tradition and the canons. Perhaps will I one day command one like this.