You're a very good artist, this is very well-drawn. But I wanted to say that L isn't this super bizarre, socially inept idiot. He's the sort of person who has quirks while they think/work. He wouldn't randomly pile sweets on Light's forehead at night, he'd pile them while working, sort of like how some doctors have incredibly messy desks with ridiculous amounts of paperwork that they don't mind patients seeing. It's not that they don't know how it looks that their desks are that messy, it's that they've accepted that's their quirk and they've not made it a first priority to care about tidying them.
It looks like someone's really into character. Good on you, fellow citizen; now everyone will know the exact facts and truths of a person who doesn't exist in the first place therefore would not care how he will be percieved by others because he is not real.
I'm serious about that character insight, though. You must put a lot of research into your interests. I like that.