This is Colonel Thyran, commanding officer of the 143rd siege regiment, 12th line korp. Notice the dead chaos marine on the ground.
Colonel Thyran is from Imperial Armour Vol 6 - The Siege of Vraks Part 2
Colonel Thyran and the rest (c) Games-Workshop.
Done with Photoshop CS3
Music: Manowar-Gods of War and Sabaton-Art of War
Hope you like it !