I'm going to come off as a jerk here, so I appologize before hand. First off, the arangment is wonderful. It is very proffesionally done. This of course leaves the main focus of the song, the vocals. It's fairly obvious that you touched up the voice for the refrain and the constant echo effect is nice too. Of course these are all effects and not aspects of the voice itself.
It would appear you have a bit of trouble holding a specific pitch without a bit of vibrato comming through. I think the minor echo does very well to cover this up though. Also you appear to have less than perfect diction, but this could be a side effect of your very supressive dynamics, which would allow the accustics to overpower your voice to at times make the end of your words seem unneseserrily lagato.
This lagato is of course is not helped by the echo effect and I'm by no means saying you have a terrible voice. I'm just saying that your musical tallents have allowed you to overcomming any shortcommings your voice has by masking them and allowing a rendition of the song that allows for a much more vocal / instrumental ballance rather than having one aspect simply supply support.
Overall it is a very well done remix, and with your voice fits perfectly with this song when done the way you executed it. I'm just trying to provide an objective opinion, as I feel that's what anyone would want in a review; honesty.