Thanks for the kind words!

This particular shot was just me trying to see if I could capture it. There's a photographer in Finland that does similar shots with night sky in bottles using double exposures. I told my friend I could do it in a single exposure so I had to try it! This one was a lot harder than the night sky though!

Not sure about commercial use, as this is easy enough to do using Photoshop. No reason to go to this trouble unless the light painting process itself is part of the appeal!