Given the amount of comments you make on others' tracks, I'm surprised nobody has commented yet on yours.
A good start. The vocals are well recorded and performed. Sarah is right in that Stevie Nicks range on this one--that's a good thing! I think the arrangement drags a bit. The singing is mostly in your lower registers. It never really jumps up to create more excitement. That rhythm guitar doesn't vary enough. The guitars are in the same octave, I think. In any case it seems like there is a lot of stuff piling up in the same midrange frequencies as the lead vocal, giving your mix a bit of a dark and congested sound. Best example of the lack of variation is around 0:40, where you go from your verse to the chorus for the first time. There's not much of a change in the groove or energy level at that point. Maybe take the lead vocal up an octave, if your range permits. Maybe move the guitar up an octave. Or add a keyboard hook. Nice guitar solo.