You would contruct the 3d object from scratch in a 3d program, the 2d images would be used for reference. If they are orthographic images, they can be used in the program's backdrop for the Top, Side, and Front or Back viewports to assist in modeling. The modeler then uses planes called "polygons" that are held together with points, to create the shape of the object. Once the model is created, textures are added on top of it to give it it's color.

If you want to turn a 2D image into a 3D model yourself, not just a general idea of how its is done, you would first have to learn modeling starting with the very basics of 3D and the basic tools of a 3d program. 3D modeling is a very involved process and is too complicated to explain in one answer or in words alone.

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