Today I finished the landform modelling in MAYA, this is the design by Arya
Basically, I used two methods to build the landform. One involved using a single mesh and moving the vertexs. However, I realized that the mesh might become excessively dense (left land). Consequently, I switched to creating polygons to outline the reference shape. Then, I proceeded to clean up faces with more than five sides, allowing Maya to automatically correct any irregular polygonal faces in the right land.
This is the final and some details