|Greetings from the Critique Club!
Hi Tom, nice to meet ya!
A few possible reasons for the average score:
Photographers shoot a LOT of self-portraits as well as a LOT of pictures of their own gear. Sometimes it's not the best subject (as I learned in Black-on-black). You could pull this shot off, but it would have to be unique, spectacular, creative or you're going to lose points for being "ok."
The blinds are a personal preference thing. Some people will like them, some will hate them. I personally love them. I can understand, however, that at DPC if you want to appease the masses, you can't have any single element in the photo that some voters will just utterly dislike. It's creative, however, so it works here for me.
That's about all I can come up with - silhouettes are about shape, no? Try tracing your shape here and seeing if you're interested in what it creates. Look at the top shots to do the same.
Good luck and happy shooting,