I really like the lighting, the clothing, and lights from the wall and the reactor thing. They all look like real people as far as shape, shading. The only thing I don't get is how she seems to be sticking out from the wall. Has she been spotted?
Is it just me, or from that apparent angle, is she sticking way out from the wall, visible to any of the guards on the right side? If she's trying to hide behind corners, that seems like a bad choice XD
Or, maybe there's something weird with the perspective of it all as a whole?