Thank you^^
The most of the grafics are designed or redesigned for HD Textures by myself based on real materials. The sea looks realistic thanks to the modification of a shaderpack "sheus shader" and also thanks to the dynamic lightning.
I saw also videos with more realistic water, when not only the grafic is looks realistic but also the physics makes the water more realistic.
Maybe you are interested in that realistic ocean physics:
The video is in German but what you can see there is the important part.