The Bloodstained Sky

I certainly agree that the sky shouldn't always be red ... that'd be just too oppressive and overbearing. As Purityweirdsoul mentioned, gleaming white light to filter through the stained glass windows would be most welcome to invigorate the mood and senses ... all depending on what rooms/areas Miriam discovers and what beauty or evil lies within them.

What I find intriguing about the Bloodstained sky is the odd mix of black, white and red clouds in the picture. I like to think that even the powerful Mother Nature herself is being influenced by dark, foreboding forces to form such a strange weather system that lingers over the castle and beyond. But what if some of the clouds aren't what they appear to be? ...

Black Clouds - What might appear to be dark clouds could actually be swarms of flesh-eating bugs that can lay waste to people/animals what locusts do to crops. Imagine skeletons/bones randomly dropping from the sky and crashing onto the floor as Miriam explores the castle grounds.

White Clouds - Perhaps white clouds may be huge gatherings of unholy discarnate spirits that will assimilate or freeze anyone who dares to enter their space.

Red Clouds - Blood of the deceased infused with sinful magic producing red rain. Since this rain gets absorbed by the soil and roots, the vegetation develops an insatiable thirst for blood. Who knows what kind of malignant plants and trees may have mutated or evolved as a result? The rain could even tie in with the blood fountain located near to the castle.

What happens if there's a thunderstorm? The discarnate spirits become bluish electric-charged entities that descend from the sky and go in search of wayfarers to electrocute before whisking them back into the sky of doom.

Then there's the frost! The night mist freezes on the castle windows and forms into fractal haunted faces of those who've been recently murdered.