I don't know which anime/manga/fanart this is, but if you could help me, thanks in advance!
Image from shuushuu. Click to enlarge!
This image is from the video game Soul Worker Online. Your image is mirrord and the Soulworker Lion Games watermark is removed.
Soul Worker is an anime action MMORPG which takes place in the Cloudrealm, a now vacant city which only harbors the psychics and a horde of monsters. Players will learn about the fate of the city and the reason for the disappearance of all inhabitants through the course of the game, as well as possibly finding a way to reverse this catastrophe.