Don't try to understand the light source. There is no logic there; only headaches.

Believe it or not, this is the same character from this image:
http://www.furaffinity.net/view/1681835/

However she is shown here anthro/semi-human, in her steampunk getup.
Schanse is an entomologist, and one of her favourite insects are fireflies. Who doesn't like bugs that glow?

Random image I scribbled up in MSPaint. Sorta happy with it.
I'd just watched a few anime clips, so this is heavily anime inspired. Sorry.