Hi, I'm new here. But here's something that might help with visualization.
Light a candle and stare at it for 3 minutes. Notice all the details of the wax, holder, flame. Then shut your eyes and try to re-create the candle in as much detail as you can. Do this several times.
You can do this with anything. Someone's face, a nature scene, a postcard or photograph. Not only will it help your visualization, it creates new neural pathways in yr brain. It's said that Buddhist Monks can look at a tanka (a very detailed buddhist painting) and close their eyes and see the entire thing.
Hope this helps.
Ava