Create an application to work with images

Problem Statement - We are into mobile case printing business, for showing SKU images on our website we need to do lot of manual job. Example if we have a design and we want to show how it will look on 150 different phone models we have to create 150 images manually. What we are looking for is if we have one image of a phone case, then whenever we upload a design that design will superimpose directly on the sku we need and we get 150 images as output. Let us say I have an image of Messi, and I want to show to my customer how it will look if they get that image printed on their phone case, so those SKUs be it for iphones or Android phones, it will be generated. Also we have fixed dimensions for the images which are printed on phone case those rectuangular images are also required to be generated. To elaborate more [login to view URL] is the original image we upload. The other images are the output for apple phones and Asus phones. There will be print images also...means rectangular image which we will use to print on phone case