On tablet and mobiles:
You can zoom in and out of images by pinching the screen.
On desktop:
If you are using Image Approvals on a desktop, hold down CNTRL, or the command key if using a Mac, and the + or – key to zoom in and out.
If you have a mouse, whilst holding CTRL/Command you can also use the wheel to zoom in and out instead of the + or – keys.
