I gave up on initial idea to paint a character or monsters into this background as I felt it'd take away too much of the castle.
So instead I sat down, adding more details to it and here is the result.
Without giving too much clues, I wanted to give it a bit of evil feel,, that something lethal and perhaps undead was living inside the castle seen here.
Painted over several evenings, size reduced alot, no reference used.
Ask for permission before using this image for any reason.
Photoshop and a wacom intuos 3 tablet used.