well when u wanted to associate a picture to it you should of let it flow.
Maybe this was the step in order to get into an LD.
You might have pushed it away when this was the entrance.
Dont try to push anything just observe and let images form.
Once they form and you have a clear image , it will become clear and vivid
It may even start to move like animation. So just let it be and watch it.
When you said you thought you failed and then tried moving your body
I think you were in sleep paralysis and your body was asleep. I think this was a good sign and were on the right path.Dont force the sound or get mad just "look for the sound. Concentrate on remembering what it was like and some part of it should come up and “hear” it and say ahhh that sound was the one i was looking for.
I like meditation because it clears my mind and lets me see things more clearly.
I have also developed patience and a sense of peacefullness within myself which i love.
Im learning to be like water , take shape of anything any way and suiting myself to that situation and flowing never stopping or slowing down.
Edited into previous post.