For this @derangedcontest portrait day, I will be entering this shot I took last year when my uncle took me to forest for a photoshoot. On the photo, she is a professional fire dancer but on this occasion, she had a whip with LED lights. This can create a pretty nice long exposure effect. It was really hard for me to choose a photo of this session because I have several really great ones but I will go with this.
If you want to join the contest, look up the author mentioned above and get familiar with the rules.