SiteOrgin’s Features Widget allows the user to use a custom icon image. However, the image actually used is the thumbnail of the original. This caused my icons to look very low resolution. In the Features Widget code (/wordpress/wp-content/plugins/so-widgets-bundle/widgets/features/tpl/default.php) there is a line of php
$attachment = wp_get_attachment_image_src($feature['icon_image']);
According to WordPress Support the function wp_get_attachment_image_src() will return the url of the thumbnail of the image. To get it to return the full size image the line needs to be changed to
$attachment = wp_get_attachment_image_src($feature['icon_image'], $size = 'original');
Every time the plugin is update this line will need to be changed.
I have submitted a support ticket with SiteOrigin. Hopefully they will add the ability to return the original image as a feature.