The best advice I always give people is this:
Keep track of your "white space". Publishers look at that sort of thing, believe me I know! It took me years to figure out why my work was not getting picked up, I finally figured it out and started working much more
White space is what I am doing right now. Keep paragraphs short and descriptive. It is better to have many short paragraphs than one long paragraph that will actually bore the reader or confuse them. Hope this helps
Erinn