How to fix uneven images
If you switch over from another theme, there is a chance that your images may be uneven on the new LyraThemes theme.
Fix Uneven Images
In order to make your existing images compatible with the theme display and make them show up uniformly, please install and activate the Regenerate Thumbnails https://wordpress.org/plugins/regenerate-thumbnails/ plugin.
Then go to Tools > Regen. Thumbnails and let the process complete. This will resize all images to match the ideal sizes required by the theme.