Coloured character sketchup

Here I just decided to a quick sketch and colour of my character to show how I imagined it would be. I wanted to keep silver/grey on the robot to still give it the metallic texture, although I could do it white to make it more futuristic, but it might counter the 'retro' feel.

The eyes are yellow like the atomic coffee yellow version logo, and black around the eyes which is also in the logo.

I'm not sure whether to make the atom glow or not, maybe cyan or a bright green (typical radioactive kind of look), but I can experiment some more.

I like the idea of the backpack/power pack being a bag of coffee or coffee beans, it aesthetically looks nice, but if people suggest otherwise I will try the other ideas too.