Really? I remember only silouettes from the scene, but what you say makes sense...
For some time I've found it weird that in Day 3 of the story, Faythe is in her Palace ("A New Beginning"), then talks to Gabriel ("The Road To Revolution"), then is in the Palace ("Begin Again"), then is with Gabriel ("My Last Farewell"). While reading some of the descriptions in
https://www.dreamtheater.net/theastonishingtracks, I tried to find some answers. This is part of the description for "The Road To Revolution":
Elated, Princess Faythe immediately shares the news with Gabriel, who is still in hiding back at Ravenskill. (...) Gabriel and
Faythe decide it best to meet at Heaven’s Cove ahead of time in order to relish what may possibly be their final moments alone together (...)I think there is the possibility of Faythe (from the Palace) talking with Gabriel (in his hideout)
by phone - nothing in the description excludes that possibility. It seems unlikely, obviously (maybe Faythe has a phone since she is rich, but Gabriel probably doesn't), but also it sounds weird to me that Faythe would be travelling so much in one day all by herself. So, maybe.
If that was so, you could also consider the possibility that Faythe took a picture with her phone of Arhys during Day 1 in Ravenskill, and that's the picture she shows to the Townsperson in Day 2.
(Having said that, I haven't seen the video in the live show, so if it's a drawing, then what I said is stupid
)