This is less than ideal, but I have taken screenshots of the portraits instead, I don't know if this is all of them, but I don't care at this point, not unless I can get the files ripped.
According to steamdb filelist, there should be one more big portrait, of Arachne in spider form (but it may also be some code to attach the same portrait to the transformed unit, or an unused portrait inaccessible in-game)
I wonder what would happen if you were to switch the filenames for Arachne and Arachne_Spiderform around (hopefully it'd show the other one during hero selection?).
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For Dominions the easiest way would be to download the data inspector standalone from here:
https://steamcommunity.com/app/722060/discussions/0/1500126447384353349/
Then go to the resources\app\images\sprites and grab the images.
If you want to only do Egypt, then launch the inspector, go to units tab, change "any nation" filter to EA C'tis, tick "national only", and change "available" to "all units", then go through the list and drag-and-drop the pictures to some folder. Then change the nation to MA C'tis, then to LA C'tis. There will be overlap with units/heroes between these three, especially with pretenders (plus a few generic non-Egyptian pretenders like dragons you may not want). There's also LA Erytheia (Ptolemaic Kingdom).
If you click on the sprite in the inspector it will switch between normal and attack sprite if there is one (some mages/priests look funnier with their raised-hands attack sprites but other than that I wouldn't bother).
Greece is more effort because of there being multiple nations and various generic units inspired by the mediterranean region.
EA/MA Arcoscephale - Athens
LA Arcoscephale - Athens mixed with Macedonia
EA Therodos - Crete/Rhodes
EA Mekone / MA/LA Phlegra - Sparta
Optionally:
EA Berytos + MA Phaeacia - Phoenicia and Phaeacia/Scheria
EA Sauromatia - Amazons and Scythian Androphagi
I'd ignore:
EA/MA/LA Pangaea - Greek mythical creatures like satyrs, harpies and minotaurs
MA Asphodel - undead version of Pangaea
EA/MA Pelagia + EA/MA Oceania - tritons and underwater versions of land creatures