ImageQuest has the same search method as Britannica Academic Encyclopedia. It has a very similar search view to Google with a search bar along the top. You can filter your results by database e.g. National Geographic images, only include clipart, or filter by shape (portrait/landscape). If you want to select multiple photos to download use the SELECT MULTIPLE IMAGES feature on the top right.
The video below gives you an introduction to the different ways to find what you need In ImageQuest: