I hate seeing what bands loook like. I try not to find out.
But as for good music/bad music....
I'm not into angry noise shit. It's a buzz kill, and angry emotional people just waste my time.
Good music can range from innovation, lyrics, or composition. And the vibe is really important.
Some music can sound good, but the artist has no talent, so I reject them.
But really, it all comes down to whatever makes you feeeeel gooooooodddd. If you really brush aside all of that image, personality, bias bullshit, whatever you feel like dancing to, whatever massages your ears and makes you feel hungry for more, is good stuff.