Which modeling technique to use for this object?

[Geonio_Gus]

I want to model this specific object.

I tried a few ways but I’m not satisfied. What I achieved was to model the “mounds” separately and placed them side by side. I didn’t like it because it looks very different from the interaction between the “mounds” of the original object.

I tried to do it with a SubD, but I didn’t like it either.

How can I approximate my modeling to the shape of this object?

I HAD FORGOT TO ATTACH THE REFERENCE IMAGE OF THE OBJECT, IT IS THIS:

[Geonio_Gus]

Thanks, but that’s still not what I’m looking for. I’m after something with a smoother transition between the hills.

[Quan_Li]

Subd from hexa is not true circle