Loki was... well... the trickiest to portrait. He has an interesting scarred lips (Loki had his lips stitched up once). Since he is an "outsider", always creating problems and provoking the other asgardian gods, I choose to put him in those strange clothes and in a totally non-dynamic pose (if compared with Odin and Thor). And the gesture of lifting his tunic and pissing on the floor, as if he's trying to ruin the "picture". He is a trickster, after all. Here you can see the "censored" version :0)