Design artwork for a wizard theme escape room

Information for the business: Escape Room Games
Industry: Entertainment
Design details: I am looking for a designer/illustrator that can create nice artwork in a few different sizes for a new game we are creating for our escape rooms, the name will be University of Magic and it will be a harry potter wizard type theme.

In the game, players will have to cast spells, make potions and battle with dark magic to get a place at the university.

the game theme:
"You all know a famous school of Witchcraft and Wizardry. However what you don’t know about until now is Manchester's University of Magic. Why would you after all ? Your not Witches or Wizards yet. The letter dropped on your door from the University offering you a place to study Magic, will you take it?

Choose a wand and then work through a whirl wind of spells, enchantments and potions to get your place. Your results will decide your house."

2 Image sizes are needed;
1080x1920
400x400 as a thumbnail Image

If the PSD can be provided too that will be great as we will need facebook covers and images for email campaigns.
Ideas for the visual style: Harry Potter Style, Wizardy, Enchanted Doors
Things to avoid: Avoid copyright on the original harry potter.
Where the design will be used: Web, Print (possibly)
Extra notes: Attached is a sample for another room we have called The Dream. The name of the room is not required to be on the image.