Indeed the camera can mislead, it greatly compresses the distance between waves. It is very difficult to tell the height of a wave without something on it, a surfer or small boat for instance.
It's not 1 of my photos, however I know where it was almost certainly taken from, which is about 600 yards from the church tower, with the sea wall immediately beyond.
Another picture of the road along the harbourside when the tide had come in, the same road where the cars are parked in the previous photo. Everybody else had moved their cars! That road is a good 2m above the normal high water Spring tide, the pier can barely been seen, and it wasn't a particularly big tide. It was a decent wave setup surge. You wouldn't think you were inside the harbour.
I remember when I ran a holiday let in Mousehole. One of my visitors was happily photographing his car being sprayed by waves coming over the harbour wall. He refused my advice to move it quick, things were set to get worse. Next morning it was a right off. The roof caved in by the weight of water hitting it, not to mention all the damage from fair sized pebbles.