Many writers find it helpful to carry a journal around so as to be able to record things they see, feel, hear, taste, sense.
In terms of images, one way to accomplish this is to stop periodically and observe. List in phrases everything that comes to mind. Notice textures, colors, designs, sounds and contrasts. For example, the sun is shining but it is pouring!
At this time it is not important to analyze your observations, but to record them.
Your task is to take a walk at least once a week. You can cover the same territory every time or seek out different places. As you walk, stop and write. What colors are the leaves, if there are any? What noise does the wind make? Birds? Is there water trickling or rushing?
Next go online and bring up images that correspond to your recordings. Save them in a special file.
When you look at the images, what emotions rise to the surface? Contentment or unease? Why? Is there an incident in your past that relates?
Write a scene using at least three of the images you have saved. Reread looking for details and emotions.
Have fun with this one.