Screenshots are optional. A good story doesn't require fancy work or anything, especially if you know you are skilled. And since there are only a few people here who actually appreciate well written work, appeasing the superficial readers isn't very accomplishing, nor is it satisfying to me.
They are optional, but i like to give my readers a sense of where they are im my story...
You should be telling the reader what's going on through words, not actual images. You are a writer, after all. And if what you're writing isn't clear enough to give the reader a hint at what's happening, then chances are you need to rework your style until the reader can at least conjure mental image of where the characters are.
That said, personally, I believe that images -- even headers, or banners that proclaim the story's logo -- are an indication that the writer is covering up for a lack of talent by attempting to distract the reader. But that's just me.
Professional ninja. May or may not actually be back. Here for the snark and banter at most.
I do agree with Kazeto. Images will just distract your readers from the actual story. After all, your main goal is to entertain your audience by telling a story in the best ways as possible using the right word choices and structures.
Hmm, the only thing with screen shots that I even remotely enjoy is when it's fanart, and well done, with a good coloring job. Sometimes, I'll make little sprite comics at the very end, but it won't have anything to do with the story-line beside's the characters. It'll just be a little funny thing at the end. But, I really only do that for other people's fanfictions that I adore, and that's only if there are the pre-mades sprites for it. Those are always pretty cool, and the authors usually like em'.
Otherwise, screenshot's/scene art bother me, because they interuppte the whole thing- and my train of thought.