Merkel said that "taking it back by tweet was of course sobering and also a little depressing".
Trump, who attended the day one of the summit pitched the idea of discarding all tariffs and trade barriers between the USA and its G-7 allies.
"I have instructed our US Reps not to endorse the Communique as we look at Tariffs on automobiles flooding the US Market!"
The image, which drew comparisons to a Baroque painting, shows Merkel standing at the centre of the frame leaning across a table before a seated Trump, his arms crossed in defiance.
The summit did not mark the end of the transatlantic partnership between Europe and the U.S., Merkel said. "But first of all we need to make progress in implementing the Minsk agreements", she said. But it won't solve the differences, particularly on trade, with the European Union moving toward retaliatory tariffs from July on key USA goods. Let's take a look at the story behind the photo.
The Elder Scrolls: Blades brings Bethesda’s fantasy series to iOS and Android
According to Bethesda , Blades will be a massive first-person rpg for mobile devices that will have console quality graphics. With supposedly their biggest conference to date, and a new Fallout game in the works, the Bethesda stream should be fun.
In return, Mr Trump made the French president his guest at his first White House state dinner, after which the USA president said of his visitor: "I like him a lot".
Even so, dialogue with the USA president must continue and global partnerships aren't over, she said.
The leaders discussed trade in their afternoon group meeting, touching on the World Trade Organization, the North American Free Trade Agreement, and the steel and aluminum tariffs that Trump recently imposed on Canada and the European Union, the Canadian official said.
As befits his role as annual chairman of the G-7, Canadian Prime Minister Justin Trudeau's picture is taken from the side, impartially showing Mr Trump dealing with his counterparts as equals.
The 28-member bloc - soon to lose the United Kingdom after the 2016 referendum to exit the European Union - managed to grapple with a financial meltdown and the biggest influx of refugees since World War II only with "great effort", Merkel said.
Trump, who is in Singapore for negotiations with North Korea, continued to rip into United States trading partners late Sunday night Eastern Time, repeating complaints about the U.S. trade deficit and contributions to NATO.