Board Thread:General Discussion/@comment-24697901-20140407012817/@comment-24857222-20140411175614

Fragile Daydreamer wrote: Child of the Moon7 wrote: Wonderful episode!!! Definitely one of the best so far :)

I think Zelena turned green of jealousy because she still couldn't really control the magic that was inside her. She didn't learn it the way Regina did, she was born with it and that's why she has no full control over it and having such strong emotion turned her, well..green.

Or if you think about it another way, we've seen how powerful magic can physically affect the wielder. Case in point, Rumplestiltskin. He wasn't always "imp-like". But that is the DO's curse. A totally different scenario.