Looking for advice for cropping images in Mercer

Site URL: https://www.thetoolsbook.com/membership

Hello,

I could use some advice on sizing for images in a gallery on an index page. A graphic designer is creating these great illustrations, but the words are getting cut off, especially in mobile. Are there dimensions I can provide her with so the words are legible everywhere? I've used the focal button, but that still doesn't do it. The link shows 3 different sizes we've tried.

Template: Mercer

SS version 7.0

Thanks,

Jenn