The fact that you referred to these images as dark is interesting. Not everyone would have this response. Fantasy artist are quite fascinated by these sort of images and I can see them as having quite positive messages too.
So your reaction is telling you something and you've pointed out that you "feel that it might be an expression of those..."
Remember it is 'Your' code that you are working to understand. Comparing it to other internal codes too early in the process will make it harder for you to understand your codes. Go with your feeling. Trust that they are right for you. What someone else perceives from these images is just as right as yours... however your interpertations can be completely different, based on your own codes.