The phrase "a tiny picture of it" is correct and usable in written English.
You can use it when describing a small image or representation of something, often in a context where size is relevant.
Example: "In the corner of the page, there was a tiny picture of it, barely visible among the text."
Alternatives: "a small image of it" or "a miniature depiction of it".
Portraits of the white-bearded, black-hatted Rebbe adorn the walls of the Hurwitzes's living room, and a tiny picture of him hangs by the door leading out of the house.
And though he politely but consistently refused to wear one for their cameras, he was always happy to sign a Fess Parker wine label, bearing its familiar trademark: a tiny picture of a coonskin cap.
Her fingernails are exquisitely painted, each one emblazoned with a tiny picture of a palm tree rendered in multicoloured polish.
Each of them wears a tiny picture of Ayatollah Ruhollah Khomeini, the Shiite cleric who led the Iranian revolution, on his chest.
The program gave birth to a new icon on the military's maps of Afghanistan: a tiny picture of a coffee mug to indicate the location of village businesses that agreed to play CD copies of the American radio programming.
The flier had a tiny picture of a large oil we had just studied at the museum: "The Problem We All Live With," depicting a black girl in a bright white dress, escorted by federal marshals.
After seeing a tiny picture of the apartment in an online listing and spotting the tea shop's awning, she went directly to the source, and Ms. Perry put her in touch with the broker.
We sense the liberating effects in a tiny picture of the Duchess of Alba, which shows her from the back (extremely rare for aristocrats) as she playfully torments her old servant, called "la Beata," with a tiny piece of coral meant to ward off witches.
For example, when you flip through the ISO settings, a tiny picture of an dark room sits next to high ISO selection, while a sunny landscape lies next to a low one.
