use forward slashes for filenames.
png "C:/Users/Sven Littkowski/Downloads/Images/POV-Ray Textures/SL - Cloud
Cities - Habitat - Heightfield.png" // the string is in one line
I'd also strongly advise using more parser-friendly filenames - the dashes and
spaces seem a bit iffy to me.
#usingContiguousCamelCaseFilenamesIsPreferable
