Retired English Teacher
As a non-native speaker, I should be careful not to speak or write Chinese English, or to be specific, not to coin English phrases. I know that a postcard with a picture on the front of it is called a picture postcard, but I need to know whether a landscape postcard, a scenery postcard, or a scenic postcard can mean the same as a picture postcard, or whether they are also natural English. Thank you.
No. The phrase "picture postcard" to mean just a "postcard" is quite outdated and rarely used. These days, we just send people "a postcard" when we are on holiday.
It is, however, used sometimes to describe a particularly idyllic scene.
"The picture-postcard village of Hamden is nestled amongst the Malvern Hills and boasts a large number of tiny, thatched cottages." There, "picture-postcard" is used as an adjective.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.