After some helpful feedback we have given the website a bit of a makeover.
The size of all the cover images have been increased. For a sample of the previews see: https://www.pesdapress.com/index.php/shop/
The images on the main pages and the text on larger screens have also been enlarged. For an example see: https://www.pesdapress.com/index.php/product/south-east-trail-running/