The first picture of the orchestra, even though it's not a JW symbol is a metaphor for any totalitarian organisation. No individual choice allowed just total cooperation under the direction of the conductor Kim Jong Un or the governing body in the case of JWs.
The NK pictures, just like JW official artwork represent the ideal society living in apparent harmony but as we know with both the Kim cult and the Watchtower it's just a facade with the members suffering anxieties due to the economic hardships and mental stress caused by official policies.
Totalitarian societies empower the leaders and take from the subjects. Disagree and you're dead.