It was the WH photographer not the press pool.
https://www.pbs.org/newshour/arts/like-president-trumps-white-house-photographer
...As the weeks passed, media reports began to suggest that Trump was actually avoiding Shealah Craighead, his new photographer, as many pictures posted to social media by the White House were taken by other members of staff. And after day 50 of the presidency, when Craighead released her first real set of photos, photography websites declared her a rigid, boring photographer, unable or willing to take candid or unguarded photos of the president.
But critics really had little to assess, with Craighead and her staff releasing far fewer photos to the White House Flickr account or other social media than her predecessor, Pete Souza, who had photographed two administrations and been granted extraordinary access to Barack Obama. (Since leaving his position, Souza had kept posting photos of the former president, often in an attempt to show Obama in a better light than Trump)...
... In a second conversation, she also answered criticisms about her lack of access. This conversation has been edited and condensed slightly for length and clarity.