Even if the underlying image file isn't resized, it'd be good if a maximum image display size was forced in CSS. Scrolling through loads of pictures way taller than the screen, combined with 1 sentence of text tucked away under it, is a rather poor reading experience.

Just a little max-height: 60vh; on all <img>s would help a lot - and be a lot easier to implement than resizing the image file itself.