We want our writing to feel genuine, and to connect with our readers to the point where they can visualize our words in their heads. A great way to learn to connect to readers through writing is by understanding the difference between concrete and abstract details. A concrete detail/image, most of the time, will engage your reader, and make them have that visual and deep reaction to your writing.
Concrete vs Abstract. A concrete detail/image is one that is grounded in tangible ideas, examples, and descriptions. An abstract detail/image has language and examples that are conceptual and have multiple interpretations.
Concrete: The plant just barely brushed the bottom of my knee; its flower was broad as my face, and its stem as thick as my pinky.