I think this piece of art is truly amazing. A lot of people go for the classic look of them two, you know L with candy or something, etc. but you truly have made them shine in a way. I love how you drew them in a very realistic way, but still kept them very cartoon-ish. The lines are great, there is a lot of detail which is very good, and the colors blend and match perfectly. I love the art is very radiant, very eye-catching, and very unique. I love it!
Keep working hard, and improve your skill's gradually.
It's more an anime/manga-ish drawing not cartoon.
I don't think this is anime or manga actually. I watched Death Note, and I know that it's an anime, but this piece doesn't quite fit in that category ^_^ at least not to me, but that's just my opinion.
I think that the Originality rating is about one star too high. Mostly because this is a fanart.
Fanart, or not, I was mostly talking about the way the person drew it