On the homepage where all the services are displayed I would like the feature images to have a link to to the service as well.
You can try to do the following.
Open the theme folder and edit
inc/framework/widgets/front-services.php file using a text editor.
<?php the_post_thumbnail('astrid-small-thumb'); ?> string on line 127 and replace it with
<a href="<?php the_permalink(); ?>"><?php the_post_thumbnail('astrid-small-thumb'); ?></a>
But please note that you’ll have to repeat this modification after each theme update (however we might include this feature in future update).
Also it would be nice for the feature image or the title to have some kind of hover effect.
I would be glad to help you, but can you please describe what exactly you want to achieve?
Kind Regards, Roman.