My condolences for your loss. It can be hard to find something that has the right tone. I had three or four false starts before I landed on the final one that I felt captured what I was looking for.
I know what you mean. I have a similar one that I did for my dad about six years ago when he passed and I still get a teary when I watch it now and then.
I don't know the original, but I can see why you couldn't get it out of your head. It's a beautiful piece, and your version does it justice. The combination of the acoustic guitar and your vocals is fantastic.
jeff