Make "missing image" fit the screen rather than an awkward scale
This "issue" is more pronounced in Webtoon mode on wide screen devices (or perhaps mobile phones in horizontal mode as well?) than in other modes, but I feel as though it affects all.
Basically, since the sad face is larger vertically than horizontically, scaling to width makes it several pages long and also forces the user to scroll to reach the refresh button. My suggestion is to simply render a blank page of device screen size with a big refresh button on top. Thoughts?