This beautiful cel of Serena comes from when she is visiting the graveyard with Allen and Aria. While the other two are talking about her, she reaches out and quickly catches a butterfly in her hand. As it turns out, this has some interesting results. One clue may be her odd shaped necklace. It’s similar to a military “dog tag”.

Technically this cel is incomplete since it’s missing the foreground layer, but I think it looks better without it anyways. The grave marker only gets in the way of seeing Serena.