I devised a rule for myself at one point: write fat and revise lean. If I needed one telling detail at one point, and I thought up two, I would write them both down unless one was obviously better than the other. Then I could revise in cold blood. That way, I didn't have to try to be descriptive and judgmental of my own descriptions at once. Much easier than sweating to remember that perfect telling detail that I had discarded in the first draft.
And there was a time when characters wouldn't tell me their motives in the first draft. 'Sokay. I wrote down what they did, and then on the second draft, I put in all their motivations.
Actually, neither rule gets much use now. I find myself writing the stuff all in the first draft. But then, I've had a bit of practice while applying the rules.