I really struggled to draw the individual rain drops: a) my hands have the steadiness of a 93 year old man, b)I just couldn’t get my drawing implement sharp enough, c) and then d) and then, and then and oh yeah, that too…
So, after many a frustrated battle, I had an epiphany,  I would fake the rain; so I cheated and melted wax into rivulets to emulate painted raindrops (very postmodern, layer, upon layer, upon layer!)