Well, this is ... wow! That simple gesture is so powerfull, meaningfull! It's like Thranduil say: "I'm your Father, I'm your King, stay at your place because I'm immortal and you will never be at mine." or My son, there is no way I will let you fornicate with that sylvan elf!" () Anyway, Thranduil is the alpha male here!
Thranduils' hand grabbing Legolas' hair is such a small and yet very dominating gesture and it just goes so well with the title! It's quite interesting because I have always thought that especially amongst Elves it is a rude thing to pull each other's hair for it it implies preenimence (you know, similar to wolves exposing their thorats to show submission) - so quite a thing parents could do . Anyways - good job on the expressions! I also liked the conceptual style!