I have an attic in my house that looks something like the attic in your pictures, except the roof does not have tiles. There are plywood boards that form the roof on top of the frame and asphalt shingles on top of the boards.

The insulation in my attic is for the rooms below the floor of the attic, not for the attic itself. The insulation is placed under the attic floor on top of the material that forms the ceiling of the room below. My attic is not suitable as living space. It is hot in the summer and cold in the winter. I use if for storage of things that are not sensitive to changes in temperature. The rooms below are well insulated and cozy in winter.