Graphic/Web Designer with Magento Experience Required to put together 5 images into 1

I need a Graphic/Web Designer to take 5 images and put them together as 1 image that looks nice and showcases the new colours in a product (bean bags). Immediately below I will provide another 3 images to just put in one line with a label to show the 3 colours - Brown, Marble, Crocodile.

I will then want them to upload that image to our Magento website. I have set up the products, but I don't know how to add an image to a product. The exact same image can be used for all the products.