To "change the picture" means to alter or modify the way something is perceived or understood. It suggests transforming the current situation, perspective, or view in order to bring about a different understanding or outcome. Full definition
It substantially changes the picture of which schools are succeeding and which are not. (articles.latimes.com)
You can use these wave gestures to unlock, put it on standby, pull down the notification down, play next song as well as change the picture in the gallery. (phoneradar.com)
We made a photo board for our daughter a few years back but she hasn't changed the pictures out in a while. (fashionbeyondforty.com)