Burns
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The line at the bottom of the picture, where the wall and ceiling meet, makes it look like a sag but it could be a trick of the angle/lens. Take a 3 foot or longer level and get up there; should see how bad it's off/sagging. Could also allow you to feel if any more pockets of mud are separating from the ceiling. Never scraped mud from drywall, but it might not be that hard to just redo the whole thing.
Did a quick YouTube search and of course there are a bunch of drywall tips. This guy looks like a pro and has a whole bunch of drywall vids (including mudding an entire ceiling w/ texture):
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