MOC nicely shot some actual pictures of IS Spirit from their stock, comparing her to another in-stock 1:6 scale bjds, Xagadoll Lara.
Here's her head. Is it just her wonky eye placement, or are her eye holes carved strangely?
A comparison of Lara and Spirit shows that Lara has more realistic detailing in her shoulders, hands and legs, while Spirit is sculpted in a less detailed, more "doll-like" manner. Lara also has double joints, while Spirit is single-jointed.
A look from the rear. I like Lara's body better than Spirit's because it's a) double-jointed and b) more detailed.