That patch of blue sky on the right doesn't feel quite right and takes the realism out of it a bit.

I know, just me being fussy. Impressive use of canvas though, it could be really nice as an appeasing background image on a site. Using the navigator geolocalisation and a weather site we could have a weather sensitive site. Have to test resource wise and see.

That one looks much less realistic to me. There were no long streak from drops that slid all the way down.

It resolves the overlap, but doesn't combine the drops into a larger single drop.