( picture postcards)
Note: The spelling 'picture-postcard' is also used for meaning 2.
1.
A picture postcard is a postcard with a photograph of a place on it. People often buy picture postcards of places they visit when on holiday.
N-COUNT
2.
You can use picture postcard to describe a place that is very attractive.
...picture-postcard Normandy villages.
= picturesque
ADJ : ADJ n