Cool! a bit practice, a sustain-pedal and a better piano-sound and it will be awesome, looking forward to here the final product when you've made a nice production of it!
And if you've learned all that by ear, you've got a damn good ear mate!

I too tried to play "i was lost without you" all night, this is what I came up with. And yeah, I need some practice too. But its all for fun

here is my try!
www.youtube.com/watch