Don't describe anything that doesn't come to you. If a sense doesn't come, lets say all you say is what you see, then THAT'S what you see, don't try to throw stuff in there just to make sure it's an anatomically correct image stream. The #1 mistake is to not say it OUT LOUD into a tape recorder. Mental talk is the difference between meditation and image streaming. Get a voice activated recorder so you can sit there as long as you want without worrying about wasted time or tape. I've done that and sometimes I find myself just sitting there doing nothing and I just say "well, that was a nice meditation" and that's that.