The redhead doesn't seem to be quite happy with her soulmate... The way she's holding the knife (or sword, or dagger, or, I donno) it kind of looks like she's thinking: It was fun for a while, but now it's time to end this.
Crazy... not sure how else to describe it. It definitely very well painted, good color choice and technique. But It doesn't seem like the two characters are as intimate as "soul mates".