Loving the two units so far. The modern scientist and the ancient spy is exactly what I imagined when clicking this thread.
As for suggestions and inspiration I might lend a small hand:
Female modern great artist
Seeing as how the male version is essentially Elvis, I don't think it would matter if we draw some person-specific resemblance to a great female artist. And who better than Marilyn Monroe? Blonde wavy hair, ruby red lipstick, and the obligatory white dress.
Finding pictures examples of this isn't hard, just do an image search for
marilyn monroe dress and there's plenty of examples. The specific white dress she's often remembered for comes from the
"subway grate" scene in the movie classic
The Seven Year Itch (1955). Hah! If you could make the dress blow up when you activate her for a Golden Age, that'd be hilarious and quite an homage.
Female ancient great artist
If we look at the male version, his clothes is vibrant, has a feather in his hat and is probably wearing trinkets and baubles. For this one I keep thinking along the lines of instrument playing minstrels or bards, but in truth it could be any form of artist. I'm not quite sure which keywords I'd use to find some image examples though, maybe something from phantasy drawings and sketches.
Female great prophet
I was thinking something along the lines of nuns, but that's probably too religion specific.
Female modern great general
My idea would be a cross between Angeline Jolie's character in
Sky Captain and the World of Tomorrow and Gemma Atkinson's character from Red Alert 3 (The british one). See attached images.

My quick searches didn't provide an image showing her entire uniform with pants aswell, but I'm sure you can find some movie stills.

Maybe you should put a longer skirt on this last one though, I'd hate to see my Modern Armor suddenly veer off to the side because the crew are busy staring at their general behind them
Keep up the good work.