You're missing the legal text that declaims this is an independently published material for Shadowdark, just the logo is not enough. Without that your submissions could not qualify according to the rules and all stat blocks you copied from the Shadowdark books could be considered illegal.
Some of the links you have in the "Link to assets used" are already dead or they point at something unrelated.
- Town Art: The link takes me to an image of a piece of brown leather.
- Skull : 404 page not found
The cover art is pure gold, I love it! But think you missed and opportunity not putting the black Shadowdark logo on the left yellow stripe.
It's a small thing but I miss the page numberes.
The overall feel and layout makes it very easy to read trough this adventure. I love the style of your maps too.
I think you made a geat job capuring the essence of the coverart you got.