I realise this is your first effort but I'll be frank here - apologies in advance!
I don't like it, it *looks* too much like a first effort. I don't like the hard line on the sky, I realise that's probably a deliberate effect but my first impression was that you got the layers messed up. Also what the hell is going on underneath the platform? You seem to have some sort of beam there which really does look like an error rather than a deliberate effect.
If you want to keep the design simple and uncluttered then fine but I would suggest making the whole thing grainer or more distorted, I think it would look alright then. I like the general idea, it looks sort of melancholy and quiet, slightly dark, so I get the idea that the band is a rock band that, while not exactly heavy metal, makes relatively dark music. I hope that's the efect your trying to create and that it's not a lets-all-go out-clubbing-and-love-each-other-style pop band. Of course these are just my own opinions and I'm definitely not an artist of any kind but this might be of help to you.