I like April & Mercede's because it does look like they are sisters. But it doesn't give off an incest vibe, it gives off a "I love you, Sis!" vibe, especially since April does look like she's sleeping XD XD
I do like Shandi and Yoanna's hair contrast though. That's really nice. Yoanna definately stills the show in it. I think Shandi does indeed look like she's in pain and her shoulder looks like she put it up too much.