https://wordpress.org/plugins/my-eyes-are-up-here/
Improve your custom images with:
- automatic face detector
- or if you want even more control, you can manually add hotspots (focal point)
- Check compatibility with current WP, as this one seems to be lagging on updates.
Great new alternative:
https://wordpress.org/plugins/shortpixel-adaptive-images/
- Smart cropping does same. See example
my-eyes-are-up-here