We have a number of filters available to help you find the images you need.
After searching for an image either by clicking on a category or by manual search you will see these options appear in the top right of the screen.

HDR - turning this option on will remove any image that was not shot in multiple exposures.

Perspective - This allows you to filter your Search results according to whether the photo is Looking up, down, or straight.

Resolution - Set the minimum size of the image, this can be chosen in Megapixels or Pixel Resolution (long edge).