Painting Mech process tutorial continue still work in process

Painting Mech Robot process tutorial continue still work in process.

From the very sketchy thumbnail composition last time, now I am going to the stage of what we usually called under-painting. At this stage, I am just focusing on the BIG shapes or the big elements of the Mech Concept's geometry form (forget the tiny bitty little detail for now). Focus on the main shape of the object and the direction of the light. And if there is under lighting, look out for that too. Also keep in mind what kind of material the concept design composed of such as metal (*video tutorial sample: art tutorial knight metal armor), gold (art tutorial painting gold color), rubber and such.
As for this image, I am shooting for finished shiny yellow color coat over metal, similar to somewhat like a yellow sport car or something of that sort. But nothing is set in stone at this point, since now I have to overall shape paint...I can still tweak the material or some of the pose if I need to (thanks to digital painting).
**I'm still not sure about the machine gun hand direction. The way it's position is more like a soldier holding an machine gun rather than the actual Mecha would hold it's own machine gun hand.

Here is "painting Mecha step by step" so far