Looks like writer's block to me. Looks like a candle I have on my desk. LOL.
Decently setup image. Content and composition are fine. The blank page opened is a nice touch. Focus is generally good.
It is doubtful viewers will have any problem seeing how it meets the challenge topic.
There are a couple technical issues to consider. Though in color this image really only has one color and because of the nature of this challenge you might want to try B&W to see how that looks. Generally speaking cameras record low light objects with a yellow hue and it doesn't really look all that good even when it is accurate. :)
Focus is centered on the candle which might confuse viewers considering this for a "darkness" challenge. That also gives makes the foreground part of the image out of focus. It could be that way to support your image theme,but generally viewer's do not like out of focus intents in the foreground and vote them lower. You might consider a wider depth of field or centering the focus on the pen to see what that looks like.
The candle flame is also overexposed which usually does not work but seems to be OK in this image.
Nice interpretation of the challenge. I know the feeling of getting lost in thought. I think I might have preferred the angle on the book to either be straight, or more tilted, but I love the rest of the composition. Perhaps a prettier candle? Well done nonetheless.