Trouble with rounded image shortcode

Hi,

I’m trying to replace the circular images on the home page of my site…I’ve tried 353×353 and 350×350…it doesn’t seem to work. Either I get a space above the new image (inside the circle) and/or the content next to it moves on me. Can you please tell me how to correct this. Thanks.

I’m also wondering if there’s a way to add more images within the circular areas to make a small slide show in each.

My site: https://www.gc-in.net