I knew Blake was a visual learner when he was very young.  He was non verbal until he was three and a half. When he was almost two the therapist that was coming to the house kept mentioning how smart he was. Of course being a first time mom I knew my child was smart but I wanted her to prove it to me. She proceeded to write a word on the little whiteboard she carried around with her and he would sign it in sign language. It was AMAZING!!!
From then on we worked mostly with visual prompts to help Blake on a daily basis. He learned how to wash his hands with a picture schedule. He learned all of his Dolch words with flashcards and he learned how to talk with pictures I took with a camera. His language exploded and we were so happy.