Urien is a lot of points for what you are using him for. Venoms kill wraithknights much better and from a safer distance.
And i would find a few points to put Either Sails on your raiders. Wyches are fragile, so getting them across the board into your opponents face turn 1 is a good idea.
The Talos seems out of place as well. You have a lot of fast moving, agile units, backed up by a super slow ponderous model. It goes against the grain of your army. Bloodbrides might be a tad better suited for this army.