First of all, I had to cut the plastic in order to avoid the so obvious quadrangular shape. Then I used cheap and easy papier-mâché technique to make it look more like a hill. These were the basics:
|It doesn't look too impressive, I know. Give some time|
|Now it looks like buried in snow|
|Winter is coming|
The best thing about working in summer is that you can leave anything on the window and it dries in minutes. It has really saved me a lot of time.
Though I'm pleased with the result, I think I could add some more details. What would you think about some ivy on the walls? Maybe some more vegetation all over the hill? If I were for any or those I would need some tutorials, but I find the idea appealing...