I have always loved cinematic music, and I was looking for some existing music I could add a flute line over the top which did not get me in trouble in regards to music licensing. I found this piece by Caleb Etheridge on Artist.
I did some improvisation to it and then wrote out what I improvised. You can find the flute sheet music here.
I hope you enjoy and feel free to comment below and tell me whether you think this improvisation works!