Web Developer. Image Edition. psd file

I'm doing a art sale web page. When a new frame is made the admin will upload an image like this. 1

but I have to show this. 2

I have the .psd file and it can be do it manually with an editor. 3

But I needt it to be done online and automatically. Like those pages that sell printed t-shirts, it is the same t-shirt with different images in the front. How can I do it? What is the name for this? Or where can I investigate it?