The American team, which made its debut in 2016, tweaked its livery ahead of the season by introducing a greater degree of grey.
Ahead of Monaco, it has gone further down that route by replacing almost all of the red portions of the car with grey.
The angular accent mark at the rear of the engine cover remains in red, as do the team and Haas Automation logos.
Haas team principal Gunther Steiner suggested the changes had come about following the requirements for greater visibility of the numbers.
The new rules demand driver numbers can be seen from the front of the car and that either numbers or a driver's three letter abbreviation be placed on the side of the car.
"It is for the whole year now," said Steiner of the livery.
"With the change in the size of the numbers and its positioning, we looked into making the entire car a little more visible."
Source : https://au.eurosport.com/formula-1/haas-changes-livery-for-rest-of-2017-season_sto6171825/story.shtml