This robot looks like it's just finished its work, crouching down to check out the pile of rubbish it has collected. Its red eyes glow in the dark, and its antennas on top suggest some kind of futuristic intelligence. But most surprisingly, it's holding a delicate flower in its metal grip. Maybe it's a sign of respect for nature, or an appreciation for something beautiful and wild. To colour this robot, I'd use silver, black, and bright red for the eyes, to give it a modern look. The flower can be a rainbow of colours, and to emphasise the dirt on the rubbish, use a variety of earthy tones.