Strictly speaking, you don't, as I understand it, enter the picture - your subconscious creates an astral scene which is identical to that poster, and you then enter that scene.
So no, moving something while you're there won't alter the picture, as you're not in the picture, but in a scene based on the picture.
There's an illustrated explanation at this page that's a bit more detailed.
So no, moving something while you're there won't alter the picture, as you're not in the picture, but in a scene based on the picture.
There's an illustrated explanation at this page that's a bit more detailed.