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Nice, could use more work! =)
The slinky looks the most unfinished. It's overall shape is jaggy, it should not be transparent, it could use strong highlights/speculars to make it look more like metal (so could the unpainted robot parts).
The robot's feet and top of the head are not proper iso and jaggy. The key is too yellow, not very visible and doesn't look like metal.
All shadows could be darker / more contrasted, and they need to be consistent with a light source angle.
Palette needs severe trimming ;) Many of these 66 colors are so close as to be indistinguishable. Aim for 32 or less!
Go, Robot, go!