What is the efficient way to create this model in Blender?
How can I create such surfaces?
You first need to model the head, let's say it's Suzanne's head, give it a Subdivision Surface modifier and right click > Shade Smooth in order to make the surface round and smooth:
To cut the head in several pieces, select an edge, bevel it with CtrlB:
Then X to delete the faces:
Then rearrange a bit the topology if you want sharp edges, i.e. extrude the border edges. To give thickness give your object a Solidify modifier that you put above the Subdivision Surface modifier:
For the plastic material, you need a low Roughness value:
I think the best way to create that is to first sculpt the head in Blender's sculpt mode. After you sculpt a detailed head model, I would box model the shape of the the part that is cut out in the front of the face. Then I would overlap the cutout shape over the sculpt, and then use the boolean modifier, to cut the shape out of the head sculpt. Then, I would retopologize the head sculpt, so that the model is smooth and less dense. Also, you will need to duplicate the head sculpt, and boolean away the other parts, to make a separate mesh for the glass visor on the front. And I would retopologize the glass part as well. It also looks like the white piece is actually pretty thin, so After retopoligy, I would give it the solidify modifier, and also possibly the sub-surf modifier, to give it some thickness and smooth out the object. Hope this helps!