The real secret to star fields is not just the human touch: it's all in the simple process of never stopping. All the steps laid out for you can be repeated, taken out of sequence, etc. In fact, the more layers you have, and the more work you put into your star field, the better it will be, because you're drawing closer and closer to the crucial aspect of a star field that most people overlook: it isn't drawn at all, it evolves.