This mysterious castle atop the hill looks like a place for monsters. Its towers reach for the sky, and its thick walls signal safety from the dark forest that blankets the land. The monster, Frankenstein, is standing at the entry, his green skin and stitches a testament to his other-worldly nature. He welcomes his guests with open arms, and the castle behind him is filled with dark and gothic decorations.
If coloring this image, I would begin by painting the sky a deep midnight blue and adding some little stars. I may even add in a crescent moon to complete the mood. I would then move on to the looming castle, painting its walls a stone grey and its windows a blackish-green. The thick walls will be accented with a deep burgundy while more gargoyles adorn the roof. Frankenstein can be painted in greyish hues, to capture the eerie feeling of his skin. Finish the piece with some emerald greens and shocking yellows for the forest and ground. This will create a deep and spooky setting for this terrifying castle.