I answered this in a previous post,however, I will reiterate for prosterity.
When you image stream it should be like viewing a scene thru a VIEW MASTER. With practice you will mentally see full color,depth,characters,shading,etc.
An excellent exercise in pre-image streaming technique is to look thru a VIEW MASTER and verbally (out loud) describe in detail what you see..the color..depth..etc.
Let a few hours past..and then mentally rehash what you saw and described thru the view master...you are now image streaming..now go listen to LUCY IN THE SKY WITH DIAMONDS on the Beatles SGT. Peppers album and image stream. WOW..what a wonderful trip it is.