The Clover Online image editor can handle a wide array of images. However, there are limits, and if the image size is too far off from the ideal size, images may appear distorted. If your images aren't appearing as desired, try cropping the photo to as close as the sizes below, for each kind of image (shown as heightXwidth):
"Hero" or background image for the home page: 860X1920
"Hero" or background image for the categories page: 520X1920
Product Images (no matter the size, should always be square): 450-600X450-600
Logo Images: 200-300X100-150
If you need help resizing images, please visit this support section.