I already mentioned that I have joined a Scifi Writers Group near me.
I took my first chapter of my second book, The Broken Cage, for review and discussion. I received a ton of really good feedback. What makes it so good is that in addition to being writers these folks are Scifi readers!
It's very interesting how not only do they help point out things that i missed, they are asking the questions that I want the readers to wonder about.
--I highly recommend finding a writers group! Maybe even start one!