My first novel was full of too much telling and not enough showing. The voice was strong, but the lack of active images meant it was less engaging. My second novel was all active, all show, and because of that, my voice lessened and it became lifeless.
These two extremes forced me to find a middle ground, and it’s taken me all this time to find it. A strong narrative voice comes from being in the action as a human being, and then authentically expressing the words that come to your mind onto the paper. Wheather its something about the scenary, about the characters description, about what he/she is thinking. This combination of switches is the expression of the narrative voice, and the more authentic you are with what your mind is trying to say, the stronger the narrative voice will be.
If we are too calcuated in our expression i.e adjection, noun, verb, adjective, noun, verb (although we will have a clear picture of what’s going on visually), there won’t be that hook, that engagement that sucks a reader in and makes them want to read on.
Be real, be authentic, and be in the action. those are the principles.