I think I can identify 3 of the 4.
The signature in black, on the guitar player, looks like Matthew Ashman (the original guitarist) who is in the photo and appears to have signed his first name only.
The signature in green, above the drummer, looks like David Barbarossa (the original drummer) who is in the photo and appears to have signed his last name only.
I can't identify the signature or signatures in black, above the bass player. It should be Leigh Gorman (the original bassist) who is in the photo, but it looks like two different signatures.
The signature in blue, on the singer, is Annabella Lwin, who appears to have signed "Best Wishes, Annabella"
