But seeing isn't easy...
We all know writers are observers. But it's not just a matter of opening your eyes. It's a matter of seeing past things, getting at hidden machinations, understanding the context of what's unfolding before your eyes. Say you're trying to capture a scene that recalls a childhood summer. Sure, you have to see it in your mind's eye. (Duh.)
But the trick is to understand WHAT elements to focus on (sandy sandwiches? Your mom's big old laugh rippling across the beach?). Also, HOW they're evocative (The texture of the sandwich's sun-softened, tepid, kinda nasty cheese? The chink of ice settling in your mom's Tab soda glass?)
And, finally, WHY that specific element captures enough of a truth to resonate with the reader (sandy sandwiches representing the freedom from school lunchtime? The near desperate way mothers would finally relax--now that the fathers were all safely back in the city and, yanno, unaware that it probably wasn't Tab soda in her glass?).
Clearly, Deviantart's blindedangel knew how to see. Look at how evocative this is.
Get it? It's all in what you see -- and then what you spot behind what you see. Of course, the second half is the ability to get it down right, and that takes, yanno, writing chops. But seeing is the critical part, I think, because
...Seeing is believing.
And verisimilitude is what makes a story come alive. See?