There's nothing realistic with that Harley's face. Look at the proportions of the eyes, nose. It's not realistic at all, it shows the influences of manga ish style, because it's based on artgerm's art.
Oh you can't put artgerm's manga-ish style along with Jim lee, Marc, and Todd's. Artgerm's style shows larger manga/hongkong-ish style influence than Jim, Marc, and Todd's. The other artist with manga-ish influence is Joe Mad, but at least Joe Mad has 50-50, balanced style of manga and US. Artgerm's style is too manga-ish (not completely manga like Sailor Moon of course, altough not all manga look like Sailor Moon, you can see "Monster", "Gantz" with completely different style than Sailor Moon, google em and you'll know what I mean). I just think that Artgerm's style doesnt't fit well with the realism of the PF.
It's the realism like the upcoming Red Sonja PF that works well with PF, IMHO. And Batgirl and Powergirl's face is at that level of realism, unlike Ivy and Harley, which is in the manga-ish style. It's inconsistent with the other PF, especially the male ones.