You didn’t really pose a question here, but I’ll assume you want circle images…
the best way would be to make sure your images are perfectly square and then add the following css to your custom css plugin (if you have one) or to your child theme’s ‘style.css’ file.
.img_thumb_feature img{
border-radius: 50%;
}
If your images aren’t perfectly square that bit of code will make them look like ovals.
you can do a nasty little trick to ‘stretch’ the images to a square format by defining a set height, although I wouldn’t recommend it. Because it eliminates the responsive aspect of what you have now, and makes the images look awful.