The doctor walked out of the operating room looking worried.
Tips
grammar
面带 takes a word for an expression as its object: 面带微笑 'with a smile', 面带愁容 'looking worried', 面带怒色 'looking angry'. The phrase usually says how someone does something, with or without 地 before the verb.
register
Written style. In speech people say 脸上带着笑 'with a smile on the face'.