A couple of tips for navigating this site
Favorites - as you move between galleries you can create your own gallery of your favorite images by clicking the heart in the upper corner of each image.
Framing and Matting - you can have your chosen image matted and framed. Once you've selected your images and go to the cart, there is a "frame it" tab under each image where you can select mats and frames and see how they will look on screen.
Aspect Ratio - make sure you are careful that your desired image size fits the correct aspect ratio.