Image quality

Your template uses low quality photos, they seem to be big, as they are just stretched. Better quality can be obtained from the link with the class "open_photo"

This image seems to be visually smaller, since it is not stretched by the server, but if you look at their size, it becomes clear which photo is better.

But you don’t even have to look at the size, the image from the link looks better to the eye than the other.