I'm sorry to say, but that doesn't look like L at all, just some generic manga character.
Regardless if you're going for the movie version or manga version, L should be more hunched over, with a more bent back. His posture is really rather unique, imo.
Also, I actually think that Ken'ichi Matsuyama is way cooler in the movies, than what the L character in the manga is, so I would recommend that you study his face and hair to add more character to your sprite.