I think it's all about finding your process. So, for example, I'm always thinking up scenes as though I'm watching a movie, and I convey all the elements I'm able to convey. Whenever the mood strikes me, I return to that scene and think about all the different elements I'm able to picture in my mind, and see if all of those elements were conveyed to the reader.
For example, Simon sat in his chair waiting for the news about his wife.
But, I could expand: Waiting for news about his wife, Simon sat in his chair, unmoving even when minutes turned to hours.
Same scene, different picture.