Hey, you wrote a Beatles song! Very nice.

If you're thinking of re-doing it, I would agree that you could probably fret up a bit, if you mean in pitch--I think that would put more energy into the vocal, and maybe even up the tempo a notch or two. It has a vibrant feel to the composition, but a tad relaxed in the delivery, so those changes might give it more zest. And Floyd is right: harmonies! Maybe even some of the counterpoint kind that come in when the lead isn't singing.

Cool stuff!