I do not think the Russian Royal Family are holy deities.
If it ain’t about Christ, its not Christian.
Protestant here .. All Christians are saints. That said, the czar and his family would be our brother and sister believers who did not deserve to be murdered. Especially the kids.
Who said anything about deities? Sounds like you are inventing things (again).
This is poking a finger in Lenins eye, Sticking it to the Communist Murderers! never again will the Russians let a dumb idealology turn Mother Russia into a killing zone of fear and terror. A symbols of opposition to communism—the Royal Family should be so honored. The killers souls should burn in the Lake of Fire.
(For which reason the Holy Synod of Moscow proclaimed their glorification as Passion-Bearers -- the class of saint whose sanctity is shown in accepting a death in imitation of Christ under circumstances in which one is not kill for being a Christian per se, the first examples being Sts. Boris and Gleb.)
It is an artistic convention to portray those who have been glorified in Christ with nimbuses. Christ is portrayed with different sort of nimbus that proclaims not only His glory, but His deity and His Saving Death. A cross is always present in the nimbus on an icon of Christ, in which are the Greek letters omicron Omega nu, 'o On, the Existing One, the Greek translation of the name God gave Moses from the Burning Bush. So you see, they're not portrayed as "holy deities", but as human beings made holy by Christ