For the robot body I made 5 metal materials. These are chrome, dirty chrome, a slightly blue steel, copper and a shiny black metal. The chrome is really simple, black diffuse, white reflection, and about 0.85 glossiness value. The dirty chrome is the same, but just like the car paint, I added an extra black diffuse layer with a dirt mask using VrayBlend. The blue steel is the main material of the robot's body. I used a dark grey with just a little blue (RGB 60-60-70) for the diffuse, and a noise map with black and a lighter version of the diffuse color for the reflections. Glossiness is 0,8. The copper material has brown diffuse (80-50-35) and reflect (130-90-75) 0,75 glossiness and a dirt map applied just like the car paint. The shiny black is black diffuse, dark grey reflection and 0,8 glossiness.
For the lighting I used a Vray Dome light using a VrayHDRI texture. I wanted a little lighter area behind the robot, so I put there a Spotlight lighting the background.
I used Adaptive QMC Image Sampler and Catmull-Rom AA filter. GI was also used, Irradiance Map (Medium preset) for primary and Quasi-Monte Carlo for secondary bounces.
After some brightness, contrast and color correction I used the Burn and Dodge tool to improve some details. Finally came the title and author's name and the picture was finished.
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