This is looking fantastic. The vibrant colours and shading are superb.

A couple of minor things that stick out to me...
The transition from sand to sea on the small sandy island seems a bit sudden, like it gets to the edge of the water and then drops away vertically. Maybe some sort of texture that quickly fades as you move away from the edge...
Also, there are quite a few chimneys that are missing their shadows.

Otherwise it is looking stunning. I especially like the new core shadows.