Not much you can do. pull the rest of the tape carefully trying not to damage the finish paint and you are going to have to touchup.
If it is a flat paint on the ceiling you will probably be able to get away with a touchup in the bad areas. if the paint that pulled off was thick you will have to skim coat and paint. hopefully you have some material left from the original gallon you used, it will help when trying to spot paint. if the ceiling is a sheen you will probably see the touchups when not directly under them (try adding a little water to the paint, it helps it to blend)
My advice, learn how to cut a line with a brush and stop using tape.
If it is a flat paint on the ceiling you will probably be able to get away with a touchup in the bad areas. if the paint that pulled off was thick you will have to skim coat and paint. hopefully you have some material left from the original gallon you used, it will help when trying to spot paint. if the ceiling is a sheen you will probably see the touchups when not directly under them (try adding a little water to the paint, it helps it to blend)
My advice, learn how to cut a line with a brush and stop using tape.