It looks great! I have no idea why you are saying carpenters can spot the joints from mile away.
Because if you have done it for a living or even have just some experience with finish work like that you can see the gaps filled with caulking even on a photo on the internet( which would hide it vs being there in person ). It looks ok but there is a lot of caulking being used to cover the long/short miter cuts( outside corner ceiling by closet is very obvious ). For someone who has never done it before the OP did a good job however. Not trying to be a jerk just answer your question.