This is a past work. I'm posting it for record-keeping purposes. Created October 2018.
I added extra arms to the Hy-Gogg to increase its monstrous appearance.
I assembled it straight out of the box and used Battle Arms on the shoulders to give it four arms.
I also added claws from a weapon shop to the upper arms to give it a tentacle-like appearance.
I painted the entire body with Real Touch Markers, along with panel lining.

Hy-Gogg (Mobile Armor Transformation Modified Unit) | ガッキー's Gunpla works