poetic license

artistic /poetic license (the freedom of artists or writers to change facts in order to make a story, painting, etc. more interesting or beautiful) — поэтическая вольность; художественная вольность

poetic license (license or liberty taken by a poet, prose writer, or other artist in deviating from rule, conventional form, logic, or fact, in order to produce a desired effect) — поэтическая вольность
artistic license
Artistic license allows artists to distort facts, change rules or omit details to improve their work of art. It also is often referred to as historical license or poetic license, though it also can be called narrative license.