Customising DW Timeline

Hello Enrique ! 
1. Of course ! you can replace the site’s title with a graphic on the home page, you can add the following code to the style.css file (Dashboard > Appearance > Editor )

.banner .page-title {
   background: url('FILE URL');
   height: ...px;
   width: ...px;
}

Notice: Please add the image to the Media then copy FILE URL and paste into the line code: background: url(‘FILE URL’);

2.  To remove the “Diamond shape” behind the the title on the home page, You can add the following code to the “Header Code”

<style>
.banner hgroup:after {
    background: none;
}
</style>

Hope this helps !