I do not judge him for killing the orc. Mirkwood was once Greenwood, and it is Thranduil's duty to protect his people fromm the darkness that has possessed the woods, there is no room for mercy and keeping promises to the enemy.
nevui-penim-miruvorrr: “ parvuspapilio: “ ssbobpul: “ Thranduil Legolas ” sudden sad thought about how Thranduil told Legolas that his mother has gone up to the stars and became one of them and is now.
Balcony with a view on Erebor - Candra on DeviantArt. In bonus materials there was a scene of Legolas and Thranduil talking on the balcony, and Alan Lee showed the sketch from which you can see that the balcony in the royal palace had a view on Erebor.