Since most of my writing is for turning out scripts, I'm used to writing nothing but dialogue. As a director/writer I see the play in my head, including the set. Sometimes it's hard to switch to narrative such as needed for stories. I can get the conversations going between the princess and the dragon, for instance, but I forget to describe the surroundings, to tell the story. I guess I figure everyone is seeing the story "play" in their heads. I better practice not writing dialogue. *sigh*...and if you're having trouble with dialogue, read (and write?) lots of plays.