Paddington Bear Meets Rain

I used my previous animation for this next assignment. I wanted to add some rain to the first one, but I knew it would be too complicated. With the new techniques I learned in class, I thought I could get it this time. But even though I parented an entire row of rain to a single raindrop and then used nesting/pre-compose to organize my steady stream of rain, it still pretty looks bad.

I tried desperately to use expressions to make it looks more natural, but I don't know how it works! I kept getting errors! In any case, I probably should've made the rain come down faster. Maybe then it would've looked more real. I don't know. It was too hard.