@Jesse:
1. For featured content image center, you can add the following css in “Appearance => Customize => Theme Options => Custom CSS” box:
#featured-content .featured-homepage-image { text-align: center; }
The image on mobile, that is intentional and if you want to make it like desktop then you can add the following css in “Appearance => Customize => Theme Options => Custom CSS” box:
@media screen and (max-width: 990px) {
#featured-content.layout-four .hentry:nth-child(2n+1) {
clear: none;
}
#featured-content.layout-four .hentry {
float: left;
width: 25%;
}
}