About a year ago, Bing introduced new Image Search experience that gives you some easy to manage controls to narrow down your image searches, all with a nice clean layout.
Now, Image Search has made it to two important Microsoft properties, Office (2013 and 2016), and Edge, with the "Ask Cortana" feature.
First, in Office: using any of the Office products (PowerPoint, Outlook, Word, Excel, InfoPath, OneNote, Publisher and Visio), when you navigate to "Insert>Online Pictures" from the ribbon, you'll get the Bing Image Search experience, complete with a grid of thumbnails, filters, and the ability to hover over an image to get more details about it.
Once you've filtered the images (by size, type, color, license restrictions, etc.) and chosen an image, just click on it to insert it into your document.
For Edge, Bing Image Search is now available with the right-click "Ask Cortana" feature (or, if you don't have Cortana enabled, Bing Lookup). When you're browsing and come across an image you want to know more about, just right click and "Ask Cortana", and you'll get Bings info on the image, including dimensions, other sizes available, related images and searches, and more.
You don't need to do anything to enable Bing Image Search, it should just be available for you in Office 2013 or 2016, and in Edge on Windows 10.