Frontpage header picture

Hi guys!
I would like to know if it’s possible to edit or change the picture on the frontpage header, I mean, the main one, just for the mobile view. After a few tries checking the web on mobile, first the logo doesn’t show in the middle (a bit wear), but especially the picture in the header section is a bit different, can i do it in Hestia Theme options or do I need and extra pluggin for it?

Thanks!

The page I need help with: [log in to see the link]