Create print ready files for 4 sets of large foamex boards

I am looking for someone who can create four large artwork files. The artwork will need to be split evenly across four foamex boards, that when put next to each other, create a sort of back drop (for a small theatre pantomime - Aladdin). Each foamex board would be printed double sided with a different image, giving us a total of four different backdrops Each board would be 124 cm wide and 220 cm high (creating a final backdrop that is 496 cm wide when all the boards are side by side). I found a company that can print them - [login to view URL] - 150 dpi, 1:1 ratio, CMYK, fogra 39, 5mm bleed on all edges. The plan was to buy large shutterstock images and then use photoshop filters to give them the appearance of being hand painted. However, I’ve been told by shutterstock chat support that their images would not be suitable for printing at the size I want. The four backdrops we would like to create are: Palace balcony overlooking a starry night dessert Palace interior - symmetrical image Dessert (sand dunes) at night with starry sky Middle eastern looking town - nicely lit and colourful I'm happy to pick out the images if you can send me to a website that will be able to supply artwork files large enough to actually make the boards with. If you could give me a price for creating the four scenes and then turning them into separate artwork files for each board, that would be great. I can send you more details and some images I have in mind so you have something to work from. I am NOT looking for someone to draw up original illustrations, happy to use stock imagery that can be edited in photoshop, as we don’t have the budget for original artwork.