Not bad, at all. (:

Starting off with my profession, guitar.

The acoustic sounds great, I really like its tone. But you sent it way back behind the piano and your voice. ):

Secondly,

Your voice is not bad, actually. A breath of fresh air compared to some other vocalists that come on here. (: You need a little more power behind it though. And I'm not sure if you did any mixing on the vocals. But I recommend bringing up your highs and mids a tad. The lows are really bringing down the quality. OH! The lyrics are nice too (:

And finally,

The piano sounds like it's got a chorus or something on it? I recommend taking that off and perhaps add compression and turning the volume up as well.

Overall, the guitar and piano being so far back in the mix breaks my heart, since instruments really bring out pieces like this. Yes, the vocals convey the emotion the most. But the instruments are there to emphasize and capture the listener.

I would love to hear a revised mixed and mastered version of this!
Great job! (: