Hmm, okay. That was from ep 6, where he says that justice will be done, I think the same scene as the screencap. I'll post more L gif's when I make them, now I know there's interest in them. ^.^
I'm also rewatching the series (which is very slow progress, I keep seeing good scenes and pausing to make a note of them XD), so I'll keep an eye out for a wider smile. XD
I'll give an eating one a shot, and the one of him breaking the panda cookie (*sobs for him*), as soon as I can.