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First, is there a category for articles that need images? For instance, a creature article where the creature is known to have an image, but the image has not been uploaded to the wiki? Because not editors- especially new ones- would not know a) where to find an image/how to obtain one (i.e., the art galleries are a valuable but little-known resource), and b) how to properly fill out all the sourcing & licensing info.
Second, is there a tool that allows one to see what links to a page, like "What links here" on Wikipedia? It seems a fairly basic & highly useful tool to not have easily available.
That all said, good day from the Outer Planes.
As for your second question though, Fandom has the same function over at Special:WhatLinksHere.