“A drop in the bucket”in other languages

Same idea, different pictures

English drops a single drop into a bucket. The others pick something tiny and set it beside something huge: a cumin seed in a camel's mouth in Hindi, ऊँट के मुँह में जीरा.

Japanese and Russian measure in tears: a sparrow's tears, suzume no namida, and as much as the cat wept, кот наплакал. Cats don't cry, so that's next to nothing.