It's tough for us writers, don't you think? We have a zillion words we're not supposed to use, including an entire segment of the language called adverbs (which I do use, btw). Then we're told that our writing should flow, yet not turn purple. Keep it tight, but not choppy. How are we ever to get it right?
Here's my 2c. The most important thing in writing is that the narrative flows. We work on making sure dialogue reads naturally, so why not the same for the narrative? I think that's the secret. Our novels, especially if written in 1st, should sound like your MC is talking to the reader.
Now, would a person actually say every line the way you've written it? Of course not. There has to be balance between beautiful lines and lines that move the story. And if we focus too hard on making every line beautiful, then what happens? Over writing. Author talk. We don't have to prove we can write by making a line beautiful. We prove we can write by telling an engaging story that the reader melts into, forgetting that he/she is even reading a novel written by an author.
What about you? Are you guilty of over writing? I am! :)