Agent Nephele Tempest muses about voice:
So, what's your writing style? You should know, and keep track as it evolves. Agents and editors talk about voice a lot, and the truth is that we're talking about two different things at the same time: what your writing tone and style are, and what your narrator or characters sound like. These things combine to give your story its voice–that sound, rhythm, personality that resonates in your head as you read. It's great to have a voice that's unique. You need to guard against falling into the trap of always using that signature vocabulary word or funky sentence structure you really love, though, because too much of that will make your writing all blend together and seem the same.