Thank you all for your nice comments!
I use REX 2 for clouds and water. The shallows in #3 are part of the ground scenery I used (Scilly Isles by Earth Simulations), and the great weather patterns I got with Active Sky Evolution which I think is a great way to boost the REX effect

REX is great to replace cloud textures but the FSX weather engine is just too weak in my opinion so I decided to give it a boost with Active Sky Evolution.