General terms:
* Illustration: This is a broad term, but it covers any image created to accompany and explain text.
* Visual representation: This emphasizes the fact that the image is a visual depiction of the phrase.
* Conceptual art: This applies if the image is abstract or uses symbolism to convey the meaning of the phrase.
More specific terms:
* Cartoon: If the image is humorous or uses exaggerated features.
* Infographic: If the image uses graphs, charts, or other visual elements to present data or information related to the phrase.
* Symbol: If the image uses a single iconic element to represent the phrase.
Other options:
* Phrase illustration: This is a straightforward, descriptive term.
* Idiom image: If the phrase is an idiom.
* Proverb picture: If the phrase is a proverb.
Ultimately, the best term to use depends on the specific picture and its intended purpose.