Hello,

I have visited your site, two of your blog images displaying blurry. Kindly use the images of good quality and then check back. Your current images are so small. Try to use images with little large resolutions.

In case if the images still showing blurry even after using the good quality images. Then try to increase the size of thumbnail: https://jmp.sh/3KrjNfg

Also after changing the Image Size as per your requirements from Setting >> Media run this plugin to resize all your existing images to the new size: https://wordpress.org/plugins/regenerate-thumbnails/

Best Regards.