Andrush already covered the major things. It's pretty obvious that you were layering vocals on a pre-mixed track.
The lead vocal is too loud, and he's clearly in a different room than the rest of the band.
He's also pitchy in a few places.
Assuming you don't have a really good condenser mic and a large hall to record in to get natural reverb that matches the track, your best bet is to probably put him in as dead of a room as you can find (pile up a bunch of quilts or rugs or whatever to absorb sound), close-mic him with a dynamic, make sure that you're not getting any room noise in the track, and then apply a really good reverb after.