Do you “see” them in your mind? Or behind your eyelids? Andhow do you “grab” onto an image, to take you into a dreamworld?
With the people that I’ve talked to about this they say that in order to grab onto the image is just like stepping into your dream and how you know when to do this is knowingness. I don’t know thats what they told me. I’m not quite sure if you see them in your mind or behind eyelids, but I would think you see them in your mind.
I’m no expert, but I believe you see them. Or at least kind of see them, like some middle term between imagining and seeing.
About “grabbing” and entering the dream I’m not sure, since I’ve only done this once, and I entered a normal dream… 
But I think you just have to focus on the HI and wait until it’s clear, and at one point, I think, you just feel like you’re there… the experience is probably a bit different when you enter a LD, no idea… 
Thanks. That really helps! I was really confused! I’ve been trying the WILD method, and didn’t quite get it.