Damn, that song is hard to sing. You did quite all right though. Not to sound queer, but your voice is really calming and nice to listen to.
Anyway, in the beginning a couple of tones seemed off, but after the first 'BIIIIIG, BIG HARD SUN' you recovered, and good too.
From he second B,BHS on, all the tones were practically perfect and I started to enjoy the song. Made think about how the original was, and I must say that I enjoyed this cover more than the original, what is very rare for covers/remixes.
The guitar play was also very good. Good ol' acoustic guitar play, which was just perfect.
Overall, I believe you're improving very much and please keep sending me PMs with the next song/cover, although I'll be raising my standards for the next song.
Oh yeah, the chorus... Big, hard sun? Wrooonnnnng. It's probably my perverted mind, but...