Interesting, well a guy I work with was asked to redo their image, and he asked me to do the photos as a favour, and the general feeling was to show they are serious about their music, but enjoy being who they are (I.E a little crazy) at the same time.
Ok, i think in trying to make them look a little crazy, you've over thought it a bit to much, in doing so you have moved their image from growing metal band to mcfly boyband. I know his comment was a joke, but its the way the picture connote that idea.
If your serious about doing this, then take a bit more time in preparing.
I have to agree with messiah khan on 4 being the only one id retry, not a fan of the way they are looking though, it does make you think what are they looking at, but why!!
If they are a metal band, ask them to concentrate on their image. Clothes etc.
Make the pictures a bit more moody, darker, and with more contrasty, brightness connotes happyness, connotes boyband,
Getting the metal crazy side to them should be subtle and i think should be considered last over sorting the composition, and place you take the photo as it is dominating how you take these shots atm.
To throw some ideas into the mix, a close up of one of them, say the drummer using a wide angle, twidling his sticks in his black gloved hand, looking across the frame. The rest of the guys composed around the back of him. In a dark yet selectively lit place, could be dirty, but doesnt have to be, other guy maybe looking under his hoodie at the camera, etc etc.
Will need lighting equipment but will look a million times better.