Yet, as Wikipedia indicates, for many years there have been strong suspicions that Kirov had been killed by order of Josef Stalin and the assassination was covered up in part by the posthumous honors. A few years later in his great purges, Stalin simply had people snuffed out on the pretext they were traitors. No posthumous honors. Perhaps Stalin had learned something from the Kirov experience or maybe the sheer logistics and justifications of the purges eliminated such honors.
When I was in Málaga, Spain in November I visited a branch of Saint Petersburg's excellent Russian Museum. It was holding a year-long (ending February 2019) exhibit titled "The Radiant Future: Socialist Realism in Art." A fine exhibit. Plenty of examples, some of which I even knew about before I visited. Of course I took lots of snapshots.
One painting I photographed was "Sergei Kirov Reviews the Athletic Parade" completed in 1935, a year following the assassination, and clearly part of the honors heaped on him. The artist is Alexander Nikolayevich Samokhvalov (1894-1971), Wikipedia entry here, a prominent member of what is called the Leningrad School who tended to specialize in athletic subjects.
I am not impressed by Samokhvalov paintings that I know of, and the tribute to Kirov strikes me the same way. I include it as an example of one kind of Socialist Realism and for its historical as well as political overtones. I doubt that Samokhvalov at the time of his work was aware of any controversy regarding Kirov's death.
Click on the images below to enlarge.