If you want to learn how to draw raindrops, look at other people's details. See? They smudge it. It's a good skill.

Drawing manga is easy. You can go to www.YouTube.com and go to Mark Crilley's (markcrilley is his account name) channel and view his how-to videos. It's as easy as 1-2-3. One of the best how-to's is "How to Draw a 'Big-Eyed' Manga Girl." Hope you have fun!