What Can I Do To Improve Vocals Sound?

Josh, I just listened to the version of "Blackbird" that you put online. I think you have a very charming voice! And for a sparse arrangement like this, the Male Basic effect is good enough, you don't want to over-effect the voice in this kind of setup.

So if you're not happy with what you're hearing (and you know that even some good singers never get used to their recorded voice and really like it), you should work on your singing technique - to achieve a little more support and fullness, especially in the higher registers. A couple of singing lessons with a good teacher can do wonders!