Check out our 'Image Sizing Guide': 

We've compiled a list of suggested image sizes and dimensions to make updating photos on your site easier. Refer to this as you make updates to your site.

480x320px (2:1)
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Minimum width 470px (no min length)

Employer Profile Page Header Image:

Minimum: 1220px (width) by 420px (height)
Recommended: 2000px (width) by 700px (height)
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400X150

400X400

For the images in the staff page you should be sure to upload images with square dimensions.

Aspect ratio: 2.5:1. Minimum size: 1400x560px

The most important thing to note here is the aspect ratio. If your image is larger than the minimum size requirement, but doesn't fit the aspect ratio, parts of your image will still be cropped in order to fit the frame.