Amazing photo,
An assassin droid from the year 2290, insanely detailed mechanical droid with partially hollow body and carbon fiber and platinum parts, wiring visible, complex servoes and mechanical components, futuristic sniper rifle with straight barrel, the droid is waiting for its prey, 
The droid is crouched like a human on a roof top, rainy day, epic lighting, cloudy sky, city skyline, ultra realistic, insane quality and details, flawless composition, moody scene, a technological hunter just waiting, 
perfect background, masterpiece, 
highest quality,