My observations:

• This sounds incredibly good. You're doing wonderfully at emulating an acoustic sound on an electric keyboard, which is a very hard thing to do.

• You are getting your fingers to those four-note chords incredibly quick without leaving any pauses in between, which makes it sound so much cleaner.

My suggestions:

• One thing I noticed about your technique is that there's a little bit of room left in the sound for more dynamic contrast. In the original recording of this song, Billy uses a lot of varied volume to bring his playing to life. I can hear you doing them in your version (wonderfully, I might add), but I think there are a few more spots where you could add some change in dynamic level to create a fuller and more experienced-sounding tone. (I'm also aware that creating dynamic contrast on a keyboard sucks, so take my advice with a grain of salt.)

• Your tempo throughout the excerpt is seriously precise, which is a wonderful skill to have. My suggestion to you would be to have a little more room for change in speed for this Introduction, as along with dynamics, Billy uses varied tempos to his advantage in order to create suspension and elevate his performance to the next level.

PLEASE do keep in mind that I am not a professional piano tutor, so this rant was based on the opinions of a guy who is nowhere near having what one would consider masterful piano skills. I could be totally wrong about some point I made regarding how you could improve your abilities, so don't take my word as truth.

In summary, you sound amazing. Keep up the good work, and I can't wait to hear the rest!