Another photo showed Sully comforting Bush family members on December 3 as they stood near Bush's casket at the Houston funeral home.
Vice President Mike Pence and Republican Senate leader Mitch McConnell also spoke.
As official Washington paid its respects inside the Capitol, Americans queued up outside the Capitol Visitor Center for their chance.
George W. Bush greeted Melania Trump with a kiss outside Blair House.
President Donald Trump has called for a national day of mourning Wednesday as former President George H.W. Bush is buried, leading to the closure of federal offices and some businesses.
Bush's body was flown to Washington, D.C., on Monday.
Trump salutes Bush's casket, which is lying in state in the Capitol Rotunda until Wednesday.
The military honor guard hefted his casket up the East Front steps and into the Rotunda - the same room he strolled as a congressman in the late 1960s, and which he later strode through in 1989, after taking the presidential oath of office on the Capitol's West Front steps. Said her friend Sue Miller, also in line for the viewing: "I actually think I underestimated him when he was in office". A WWII combat veteran, Bush served as a member of Congress from Texas, ambassador to the United Nations, director of the Central Intelligence Agency, vice president and 41st president of the United States.
11 a.m. ET - Funeral service at St. Martin's Episcopal Church in Houston.
Christine Dube, who lives in Vermont, but travels to DC periodically for work, said she believes Bush was from an era where people did "the right thing and you care about America and that comes first".
"He will be remembered for his decades of service to the nation and the world, and it is appropriate that the New York Stock Exchange closes on Wednesday, the National Day of Mourning, to honor President Bush's enduring legacy".