The phrase "to upgrade the look" means making improvements or changes to enhance the appearance of something.
Sentences with «to upgrade the look»
A new nail polish is the easiest way to upgrade your look with a pop of color. (thefashionablybroke.com)
It was a smart move, and money well spent because it adds such a pretty detail and really upgrades the look of the kitchen finishes. (lindsayhillinteriors.com)
So, if you get to ask me what is the simplest way to instantly upgrade your look, I would say accessories. (thefashioncuisine.com)