When we talk about summer, our first reaction is the swimming pool. Then we moved it directly into the window, and we would knew that summer was coming at a glance, straightforward way.
The pool scene is also very easy to create. It is very artistic to change a tile background image like below.
If you want to be more detailed, just put a few swimming rings and bubble balls, and instantly create a cool feeling.
You can also directly use stickers to attach elements such as sailboats and islands to the window. This is what Hermes does, plus transparent pvc paper to mimic water ripples, super realistic.
If it is troublesome, print a swimming poster directly as a POP. Then match with a model wearing a new summer product, it is instantly solved, so easy.