Fairly often in the review queues one encounters posts from new (or not-so-new) users who lack the reputation needed to include images visibly. Sometimes I have the time to replace images of equations with $\LaTeX$ equivalents, and sometimes I simply edit the Question (or Answer) to make an image visible.
My thought is that the image may not make the Question a good one, but it's a step in the direction of improvement. If the Question seems VLQ otherwise, I will not bother, and sometimes I'll make the image visible by drilling down to the underlying post and editing there (so that the Edit does not serve as an indication/tick-mark that a Review was completed). However mostly I make the image visible whenever it seems to plausibly support the Question (or Answer).
What guidelines do others follow in leaving images linked or making them visible?