So the saying goes. If a picture is worth a thousand words, then you have no excuses for writing those thousand words during NaNoWriMo.
Before or during NaNoWriMo, look for pictures to represent your character, places, scenes, things, or events and add them to your research collection. When you run out of steam, turn to them for inspiration.
Look for what is in the picture to inspire you, but also look outside the frame. What is the person wearing? Why? What does that outfit do for them? Is it a uniform? Does it work with their recreational activity, or possibly work for their best-dressed work uniform in a corporate office?
Where are they? Do their clothes match the environment they are in? Why are they there?
If it is a place, go inside the picture to see what it beyond the bushes or trees, through the doors, around the edges in your mind so you see the whole picture.
Visual inspiration may come from a variety of forms. A picture in a magazine might trigger memories or concepts while having nothing directly to do with them. Add those to your collection to stimulate your imagination.
Also take advantage of Image Search on Google and other search engines. Type in a word or phrase and switch to the image view and scroll to find an image that catches your imagination. View the image alone and print it to add it to your collection if necessary.