|Hello from the Critique Club
An interesting image that meets the challenge
'Steel wool in a whisk on a chain', hmm, look like fun! I like that you have a dynamic moving subject although its not an obvious or strong diagonal the fact is he is holding the light source at an angle so it is more an implied diagonal. The individual light trails are very effective and appealing, they fill the space very well, I particularly like the way those that are hitting the ground have been recorded. There is obvious blow out of the highlights of the light source itself but obviously there is nothing you can do about this.
Your exposure is good with detail throughout. I'm intrigued and confused by your comments about the post processing, I don't know what you mean by 'stroked'?
An interesting and creative take on the challenge brief, well done, Sid