The phrase "a tiny picture" is correct and usable in written English.
You can use it to describe an image that is small in size or dimensions.
Example: "She showed me a tiny picture of her cat that she took on her phone."
Alternatives: "a small image" or "a miniature photo."
There is also the first photograph of lightning, by William Jennings, a tiny picture, circa 1885.
Her fingernails are exquisitely painted, each one emblazoned with a tiny picture of a palm tree rendered in multicoloured polish.
It's a tiny picture, and you can't see his expression, but his feelings are made clear by the eloquence of his body language.
Each of them wears a tiny picture of Ayatollah Ruhollah Khomeini, the Shiite cleric who led the Iranian revolution, on his chest.
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.
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.
No Woman No Cry, one of the paintings with which he won the Turner prize, is dedicated to Doreen Lawrence, mother of Stephen: each of the tears falling from the eyes of the woman in the picture contains a tiny photograph of the murdered boy.
"All we saw was a teeny tiny picture that was faxed," Ms. Carter said.
They say the best things come in small packages – and in this case, one of the things we're looking forward to most over the next few months, Sony Ericsson's Android-powered XPERIA X3, has come forward in a tiny, tiny picture.
"In most of my dealings with coaches, they have a tendency to focus on that tiny picture of tonight's game only.
(Sorry for the tiny picture, which shows a CGI-model of how these houses look like).
