The phrase "a visual echo" is correct and usable in written English.
It can be used to describe a repeated or reflected visual element in art, design, or nature.
Example: "The artist created a stunning effect by incorporating a visual echo of the mountains in the background."
Alternatives: "a visual reflection" or "a visual repetition".
The effect is a visual echo chamber of reflections, shadows and silhouettes — and of people seeing, being seen and watching others see.
Amateurs passed the image to professionals, who now believe Ms. Van Arkel found something never before seen: a visual echo of a black hole's extensive light emission.
A visual echo chamber developed: rather than encouraging reporters to find the news, editors urged them to report what was on TV.
The chorus was seated on white "stone" blocks, a visual echo of Jerusalem's Jewish cemetery on the Mount of Olives, as well as the Holocaust memorial in the orchestra's home city.
First performed in 1940, the sonata interleaves the foreknowledge of war with an anguished lyricism and its dark velocity finds a visual echo in Pierre Tappon's fierce physical attack.
President Bush's dramatic (and premature) landing on an aircraft carrier last May to declare victory in Iraq in full pilot's gear was a visual echo of similarly triumphant scenes in iconic war movies such as Top Gun.
I concede there is an interesting visual echo in a later bar scene.
Stephen Fry puts in a funny turn as Sherlock's cleverer brother, Mycroft (an eerie visual echo of his Oscar Wilde), a man with a fastidious reluctance to shake hands, but, bizarrely, a habit of parading around stark naked in his own home.
The small but sublime moment during "Harry Hood," when fans near the stage tossed glow sticks and glow rings in the air, creating a neat visual echo of the neon circles that surround the stadium lights.
This move not only checkmated the administration's efforts to belittle Mr. Clarke's government service but did so with a subliminal visual echo of Tim Russert's most iconic TV image, his brandishing of his handwritten slate of electoral vote calculations on election night, 2000.
That trademark hairpiece is also, accidentally or otherwise, a little visual echo of that other famous wearer of blonde wigs, Andy Warhol, who engendered so many of our contemporary notions of celebrity, not least (and most famously) the adage about everyone having their fifteen minutes of fame.
