Does this dog look really sad ? ☹️☹️😩😩

This is my Great Dane Athena, we've had her for about a year, she's two years old and her old owners were abusive to her before they passed her on to us. She always looks like this, ears tucked and sad puppy eyes all the time .. I don't know if it's just me or not. I know she has some form of anxiety. My brothers tend to yell at her a lot because she stinks..

I don't know what to do 😞 I've had cats all my life.. this is my first dog.. please no harsh comments I already feel horrible about her situation ..