When I try to visualize an object, I can in some sense visualize it but it feels very indistinct. It's like I can't see the object as a whole only the specific details I focus on. For example, I have a friend who wears circular glasses and has a handlebar mustache. I can bring up a general image of "circular glasses" or "handlebar mustache" in my mind. However, I cannot imaging his face with glasses and a mustache. It almost feels like the way that you "see" things when you are only half watching a TV show or are partially zoned out while driving. In some sense you are seeing them but it's difficult to pull up details.
When I visualize a scene, I'm not sure I "see" it so much as I form a spatial map of the scene.
I also find that the "images" that do get stored in my memory are more like impressions. Maybe in some sense I can "visualize" them, but they are really more like impressions of how they make me feel or the "vibe" that I get from them.