"As follows" is really a way to introduce more text, often a list, for example:
My shopping list is as follows: three bananas, one bag of potatoes, three cans of soup.
The lyrics to the song are as follows:
"We all live in a yellow submarine
a yellow submarine...."
You can use "the following" in a similar way:
- I would like you to buy the following: three bananas...
However, you can refer to other things with "the following", for example, "in the following photograph" or "in the following film clip".
In the context of your example, you said it was introducing an image. You should, therefore, use "the following", and point to the image, for example:
My room looks like the following image, with concrete walls.