I can attest that all of the pictures are cropped and resized from the source material (so folks doing analysis of size and position within the frame are wasting their time).I don't know if this will help anyone's search but that picture of Tomyris isn't actually an old portrait of her. It's a crop of a larger picture drawn in 1989 showing that female archer and a couple other warriors. I'd say it's proof that the pictures can be crops and don't necessarily need to be old. They don't even need to specifically be of the person they're representing. It is still a perfect match.
Spoiler :
The illustration of the Scythian female archer is an Angus McBride illustration from the Osprey book on the Scythians; these are books primarily for miniatures wargaming and reenactment enthusiasts that show accurate period armor and military costume. I don't own the book, but I have read it. The female figure is identified in the caption as a Scythian "Female Commander"; this is what Tomyris' costume would have looked like (and if memory serves, the text mentions Tomyris as an example specifically).
In a web search for "tomyris", this is one of the only image results that presents a historically accurate costume; the others are from Renaissance-era paintings that are wildly inaccurate.