#4 is the coolest shot, with a crop you could see the band members and they all look pleasant. I am reminded of old Beatles' footage with them flopping themselves around in the snow. It's a kickin' image! I'd like it on an album cover with the title in the snow in front of them, or floating above their heads in the sky. You did very well here.
#2 is not bad, again all members show, but it looks more like the kind of image you'd send out with a press kit. (read: not particularly artsy, just show the band and read the bio)
#5 does have very nice composition but sadly it's just too dark. Try again if it really appeals to you, but if there's any time pressure you already have a winner with #4.
#1 is cool with the pinhole or Diana camera, but again they're just too dark for it to be usable. I do have band friends and some of them are weird about showing up too clearly (why I don't know, but it's their preference) SO - if these guys also lean that way, this shot is also usable as a second or third backup.
Nice photo shoot!