Which luminant objects are real and which are artistic license?

Would not plate solving with each choice give different results.

https://en.wikipedia.org/wiki/Astrometric_solving

No guessing needed for Escher's stars. He had a love for astronomy that shows up in some of his works.

https://escherinhetpaleis.nl/en/about-escher/escher-today/ye...

https://escherinhetpaleis.nl/en/about-escher/escher-today/th...