Play as a disgraced Combine metrocop in this mod for Half-Life 2. Fight your former colleauges and various Xen life as you run for your life through six varied chapters. Meet some unexpected friends and foes along the way and find out what the Combine are hiding from you - believe me, it's big.
You might want to change the textures on the arched ceiling. Think about their direction and tiling. For one, these textures have stain marks across their top edge, but they're meant to stand under something so the stains go down. Simply put, using wall textures on ceilings usually doesn't look very right.
Also, changing pure white lights to tinted lights can make your scene more interesting. For example, for inhospitable areas it can be some cold tint, and for friendly encounters it could be a warmer tint. Tinted almost always looks better than white!