Now, the time is coming to take some help and after long search, I found a tutorial on Youtube in the channel of AlexModeling, he used a similar way to build a water Diorama and I found some more help to finish my own Diorama. It looks much better now.
I make some pictures, but I thought, something looks wrong, I am not satisfied with it, there was too overdone foam on the waves. I look about some pictures in the internet and reworked my Diorama again.