I felt like Prism was just a watered-down Teenage Dream tbh, I agree with the person above who said she needs to work with someone new for the next album. Prism didn't evolve her sound at all, which isn't necessarily a bad thing, but in this case it worked against her because the songs weren't as interesting. I thought the production really fell flat on Dark Horse, and that's STILL one of my favorites from the album if only for the lack of anything else to really choose from
Walking on Air is my jam though lol