Hi @murphy, you are right, besides Pluto being fascinating, the source of my article itself references to a document about Tholins.

More precisely, they seem to have created a simulated Titan-like environment:

http://www.sciencedirect.com/science/article/pii/0019103584901428?via%3Dihub

Sounds interesting.

And yes again :-), you are absolutely right the sky of Pluto seems to be very similar to the one of the Earth. I mentioned that in the article.

Thank you for the informative reply!