It's really coming together, Richard. There's one thing you should take a look at; there's a stretched piece of fake stone near the ship's bow. A too sharp mask or fuzzy zone maybe? And I would still do some work on the rocks, make them more irregular and without the tiny displacements. Maybe a simple billowed or voronoi noise with sizes 0.5/2/0.01 and a displacement of 0.5 and offset of 0.1. See what happens then.