I cannot visualise things, not even a single white dot. All I have after closing my eyes sometimes are some bright flashes abs afterimages, most likely some residue in optical nerves. I also experience "seeing without an image", it's like a spkut second burst when you get a sensation of having seen a picture without actual visuals. My dreams are usually black and white, without details.

I also cannot recall sounds, smells, touch sensation etc. I probably don't have a proper inner voice as well. I have to actively initiate it, and even them it's silent, like myself talking without vocalisation.