Is your website responsive ? What is the difference between a static and a responsive website ? The key difference is that static websites show the same thing on mobiles and desktop devices. This means that a small thumbnail on the desktop is reduced to an invisible speck on a smartphone. Had the site been responsive it would have treated the thumbnail differently, showing it on one corner, or making minor tweaks with the size without sacrificing visibility.
A recent survey in India shows that as much as 75% searches happen on mobile devices. So its absolutely essential to have a fully responsive site. Ask your developer about what kind of site upgrades you require or do a site yourself.
It pays to be responsive.