The problem with the Google search
Anyone frequently looking for images on Google for professional use in graphics work or the likes will agree: Pinterest sucks.
Pinterest is a black hole full of images without reasonable sources that rarely have a usable resolution to begin with. Unfortunately, a large number of images displayed in the search are from here.
A simple trick
In the search bar simply add: -site: pinterest.com -site: pinterest.co.uk -site: pinterest.com.au before the search term and BOOM: the specified pages are excluded. The list can be extended indefinitely.
Have fun trying it!