Where should I add the vertices?

This is an image of a ship’s hull.

The display differs between the black areas and the opposite side of the image.

The modeling is incorrect, so I added a texture, but it’s still incorrect.

I aligned the vertex normals, but there was no change.

Untitled.blend (114.4 KB)

You should probably model a correct model.

If we have a look at a model of a ship from sketchfab , it seems the vertices need to be added here:

Hi, you need to mark the selected seam and uv unwrap the model.

thank you

I corrected the vertices.