After experimenting with LoA for 1 1/2 years now, I think that the feeling is far more important than the image you see in your mind or the thoughts you think. When you can evoke the feeling that she is with you without any wobble, then you are there. You don't even really need to visulalise in the sense that you need a clear picture. If she was next to you and you closed your eyes, you still knew that she was there without having to picture her, right? I think it's more that knowing that she is there.
What I believe to be the most important factor right now is the purity of your feeling. Abraham tell us about the emotional scale, but they also say that it isn't a digital model (okay, they don't say it this way, that's my way of putting it). There isn't just empty space between the emotions. There are infinite combinations and ways you can feel. Now, if you want to be in a happy relationship with your girl, you have to find the pure emotion you would feel, if she were with you now. Can you remember how you felt, when you got to know her for the first time and everything was perfect? You probably didn't feel fear, doubt, desperation.