Vintage photo of St Ives' Porthmeor beach taken in, what I would guess, was the 1920s.
The view west doesn't look very different at all. The shelter on Man's Head is already present and beyond that it is all rugged coast. The beachfront seems somewhat different though.
I don't recall the rocks in the middle of the picture being there these days.That means either the sand level has risen or they have been built over. In the photo you can see there is a low wall at the back of the beach, this was all built up many years ago - perhaps this was brought forward over the rocks in question.
The other notable difference is the bating huts - you don't see many of them anymore!