Actually, this is an underwater Gundam that I painted before the Gustav Karl 00 and left unfinished.
I had applied the decals and it was finished, but I hadn't taken any photos until now, so I'm finally posting it (^o^;)
I just painted the whole thing.
The bright blue and orange colors are a bit much (^o^;)
I imagined submarines to be matte black, so when I painted it with tire black and German gray, it was almost completely black... so I painted it with medium blue, blue-gray, and maroon.

Underwater Gundam | JB☆⑧'s Gunpla works