Please keep in mind that besides this scene, there is also the event "Sophia enters the battlefield" with the Morello boys. Of course, only if you have chosen this path. Since I think we will see this sequel in the next update, the number of images will be split between this event and the Amber/Dylan event.Ya it could be the about setting up the location and new lighting, that goes along with how the game looks right now. We have known that he spends a lot of time on that.
The scene itself can't be that big. Has to stay around 175 to 200. I don't think L&P will make a 400+ render event without Sophia playing a part in it.
Till now only 2 events have had 400+ renders. One was The Bikini Show - 482 renders other was Yoga Scene - 508. The third biggest event is Julia Ellie Sophia with 379 renders.