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You'd have to make an Image Pickin' thread with the reason why you think the image should be changed (poor quality, we don't have permission to use it, breaks policy, etc.), which you can alter under the dropdown menu when you make a thread. Make sure to put your reasoning in the body of the post itself when you make the thread, too, and offer up replacement suggestions (not textual ones; attach an image to your post that you think is suitable).
Wuewuewuewuewueing my way to the bank.

Hi! sorry if i'm in the wrong area, i don't come here often.
is there a way to suggest different images for pages that already have an established image? i don't know if this is really feasible, but it's worth a shot asking about, right? if you need context on the specific page, it's New Weird.