Photo left / right arrow buttons

Instead of having to specifically click the arrow to click through photos, make the entire left and right sides of photos where the arrows are a large button that extends from top to bottom of photo dimensions, and a click anywhere on this large arrow button will move user to the next / previous photo. Since some photos are landscape, and others are vertical, users have to constantly move their mouse to hover over the small arrow symbol to move between photos.

Agree.  Also FYI, you can use the right and left arrow keys instead of your mouse.