I really loved his Eric Benet cover of 'Cracks of My Broken Heart' and Craig David's 'Rise and Fall' as well.
Even though I guess he's trying to move away from his image of cute over the years, I think it's very difficult. His baby face kind of makes him adorable no matter what, even though I'm aware he's an adult, his face makes him look a lot younger. But, that's not a bad thing though :) People tend to assume I'm younger than my age too and it doesn't bother me lol.
Here's two covers that are my favorite from Yoseob: