Generally, screenwriters should focus on words rather than pictures. But in certain cases, images really help.
Lawrence Turman suggests asking random people for their opinions of your concept. Great idea for a producer, but potentially a bad idea for a screenwriter.
I’m going to be writing a big movie version of Monsterpocalpyse for DreamWorks, based on Matt Wilson’s kaiju-themed giant-monsters-smashing things extravaganza.