In addition to the lighting balance that may or may not be an issue, the placement of the new portrait seems like it could cause some issues.
The original hallway is a masterclass in carefully guiding the guests' attention through the room, subconsciously guiding them down the ever-narrowing walkway, which starts wide enough for the dual sets of oversized double doors at the stretching room and ends at a single-file line at the conveyor belt without ever feeling forced. The series of portraits along the right wall capture your eyes after exiting the stretching room, and you're then pulled forward by the busts directly ahead. You're then drawn through the compression-and-expansion of space created by the small portal under the railroad tracks and the mysterious void beyond, straight to the loading area.
This new portrait is accompanied by a new folding screen that partially obscures the initial view of the Doombuggies, and is hung on the wall opposite them. The screen will clutter up the view through the small opening to the loading area, presumably to divert attention toward the new portrait. This means that people looking at the portrait will have their backs to the loading area, pulling their focus away from their next steps, and creating a congestion point in a location where the walkway has already narrowed almost to single-file. This issue is further exacerbated by the 4-panel format of the April-December portrait, which takes a lot longer for a guest to absorb than the simple flash of lightning portraits in the larger hallway.
While it's nice to see the return of an element that was removed 10-15 years ago, the location of it seems less than ideal. Instead classic WED's cinematic unfolding that gradually reveals details, we get another modern WDI creation that seems to be inspired by the Applebee's school of thought, where more stuff on the walls is the only way to decorate a room