In terms of how these statues would have been viewed from below, or from different angles (and what they would have looked like from those angles), perhaps you were thinking of Lise Manniche’s work on the colossal statues which studies them at length and is a great read:As these statues are normally shown in publications from odd angles and lighting conditions for "effect", it's interesting to see them presented more normally, and here it's very difficult not to see the right hand statue as Nefertiti. Though it is apparently unfinished and a kilt would have been added, and, though I cannot remember right now were I read this, these statues would have been mounted higher than we see them now and that from below the distortions would not seem so great, but I'm not sure about that as I think they would look weird from any angle.
An interesting video on the subject:About "the egg-shaped heads" it depends on when ...
If we go back to Huya's tomb [a guy who lived the passage from Amenhotep to Akhenaten], we can see Nefertiti with a nice round head [The rock tombs of El Amarna .. : Davies, Norman de Garis, 1865-1941 : Free Download, Borrow, and Streaming : Internet Archive]. The same about Akhenaten ... may be before of Tiye they didn't elongate their heads!
The same here: The rock tombs of El Amarna .. : Davies, Norman de Garis, 1865-1941 : Free Download, Borrow, and Streaming : Internet Archive
Personally, also considering the mummies, I tend to think to a canon of representation.
And this is what we should keep in mind. Also in Ancient Rome there were "fashions" imported from abroad [or adopted from the conquered lands], but this didn't indicate a certain origin of the members of the imperial family.At this moment, there simply is not enough documentation to definitively prove the origins of the most powerful Amarna women