Decorating a baby’s room is all about what mom and dad want. But decorating a bedroom for a “tween-age” child is more complicated. It’s a great place to give growing adolescents some creative freedom.

Decorating a baby's room is all about what mom and dad want. But decorating a bedroom for a "tween-age" child is more complicated. It's a great place to give growing adolescents some creative freedom.

For this particular bedroom redecorating project, Boston interior designer Eric Haydel’s prime collaborator was the 11-year-old girl who occupies it. It’s the smallest of three children’s bedrooms in ...