Limits of Painting

I wanted to see if this tested within in the limits of light painting. I didn't actively paint this.  I captured this during a fireworks show for the Fourth of July in 2011. I absolutely love how it turned out.  I saw the couple in the frame but didn't realize that this would turn out as amazing as it did.

Nikon D5100
f/4.5
Exposure 20s
ISO 320
Aperture 4
No Flash

Here are two more choice captures from the same show with the same settings.

The two streaming lights one white and one red are from boats powering up river.