Hello,
Please add this code in Theme Options > Styling > Custom css:
.blog .blog-post .wp-picture {
margin: auto;
margin-top: 25px;
}
then clear cache and check http://prntscr.com/ktl989
If this is not what you are looking for, please describe the desired result in more details and provide temporary wp-admin access so I can take a closer look.
Regards