Yeah it was a bit of a let down. Much more impressive from the outside looking at it, but once inside it it was so diffuse you couldn't tell whether you were inside it or not. The Horsehead nebula looks far more impressive from the game screenshots I've seen. I'm not sure if all the nebulae are finished yet or if FDEV are leaving them how they are now. I think they could have done with being a bit more sci-fi than science for the games sake and to make them more attractive to visit.
Some nebula look a lot better: https://forums.frontier.co.uk/showthread.php?t=69599&p=1156316
So I hope that the rest will get some polish. I agree that a bit of artistic license is not a bad thing --after all artistic license has been applied with close-ups of stars and SC.
Really like your videos BTW.