This is a drawing I made for a contest - [link]
I wanted to create some dark place, little gloomy and horror.
Welcome to the dark side of London. It is very near, you just have to walk along darkest streets and gateways of city and then you will appear in this Dark World. It is always dark and cold there. You can meet here various dark creations - vampires, witches, zombies, demons and others. But not everyone can be there - only people with some magic skills. To find gates to this world is not very hard - you just have to find a sign, like this demon of Joker here - they will show you the way to this Dark World.