those are some good comparison photos, but the problem is, the entire doll body is too tall. natalie is a small person. if her doll were in 1:1 scale, it would be almost 6 foot tall.
those barbie bodies should be almost an inch shorter than they are.
here is a side by side compairison of the episode 1 amidala with a dragon female figure. notice how much larger hasbro's head is. this is what jeditricks is refering to about her head being too big.