(Portland, OR)  --  A man is facing more than seven years behind bars for violently stomping on a homeless woman's face while she played guitar downtown.  The Multnomah County District Attorney's Office says Matthew Owen was sentenced yesterday to 88 months in prison for the attack in September.  Police say the victim was playing guitar on Southwest 4th and Washington Street when she made a mistake, prompting Owen to curse at her.  The woman implied she disapproved of his language, leading Owen to shove her to the ground and stomp on her face several times.  The woman suffered broken facial bones as well as damaged teeth and a detached lower lip.