That gallery of images even includes a look at almost all of the minifigures in the set, as only the main Doctor Strange minifigure is missing from the last official picture in the below gallery.
The official images feature a look at the back of the modular build, where Gargantos is reaching through a portal. Anyone hoping to attach 76218 Sanctum Sanctorum to other modular models can rest easy knowing this portion of the wall can be detached and flipped around to be flat and not obstruct any connections.
A blueprint-adjacent image showcases the measurements of the model, with it measuring 26cm across and deep on the baseplate and 32cm tall. You can also take a closer look at the various designs on the stickers, referencing various aspects of the Marvel Cinematic Universe