Just going by what I've seen here, the art for Batgirl does vary dramatically.
This particular style works well for this sequence, it shows a lot of expression and interaction. I'm not sure how it would work for a big dramatic or poignant moment, but you never know. I was just surprised by how relatively extreme Cass' features are. If those eyes and nose and face shape were on a villainous character, it might be taken as objectionable.