Demi Lovato watches her steps as she heads into her hotel on Friday afternoon (July 27) in Miami, Fla.

The 19-year-old musician has spent the week in and out of X Factor auditions in the coastal city.

PHOTOS: Check out the latest pics of Demi Lovato

“Well, you know, I try to be positive as much as I can,” Demi dished to MTV about her judging on the program. “But sometimes you’ve just got to tell people that singing is not for them. When I hear a good singer, sometimes I critique them so that they can be better. And it’s not that they’re bad.”