For season 7 of HBO's Game of Thrones I worked as a VFX concept artist designing locations such as Dragonstone island and Eastwatch-by-the-sea.
Dragonstone had to be consistent with the little we had seen in a previous season as well as the various real-life locations that had been scouted.
I started by taking 3d scan data of the scouted locations and puzzling them together to create a 3d island where the scale and sea level were consistent and the different places lined up in a believable way. After establishing this base I concept modeled the fortress on top. The advantage of this workflow was that I could place cameras in the scene and show the director and VFX supervisor exactly what shots in these locations would look like, before painting them up.