The postcard is undated, but the various images on this card are shown on the Frith site as being taken in 1910: “Female Quarters”, “Female Entrance”, “Entrance”, “Male Quarters” and “The Terrace”. There have certainly been some changes since it was issued!
The top two images are labelled “Female Quarters” and “Female Entrance”, though there are now no female patients at the hospital.
The centre image is “Entrance”, and while the building is still standing it is now tucked away inside the wall.
The “Male Quarters shown are still there and are still in use. The hospital is currently undergoing major renovation, so perhaps in the not too distant future even this will have changed its usage.
I’m not quite sure where “The Terrace” was, but I suspect it has long since been incorporated into the main hospital and is no longer in existence.