Hello modelli!
There's a lot of themes that that don't quite make a full or great implementation of responsive design yet. Sometimes it's a good idea to play with the demo site a lot by resizing the browser before settling on one and having someone skilled modify the looks via css. In your case, one thing you can do right away to help with that homepage image is add the following code to your custom css file or plugin. If the first doesn't work try the second. Keep me posted and let me know if there's anything more i can do. My info can be found by clicking on my avatar photo :) Best Regards,
Danny :)
img {
max-width: 100%;
height: auto;
}img {
max-width: 100% !important;
height: auto;
}