I really love sites full of gorgeous, detailed images that block my browser's zoom feature. /s
I tried zooming in on images using iPhone X / Safari and there is no issue. Are you sure something isn't wrong at your end?
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no" />
What browser are you using where the zoom feature is blocked?
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes" />