It's 1/144 MS-09RⅡ Rick Dom II.
I don't have the HGUC box with me right now, so I'm checking the model number and other information from the box of an older kit I have nearby.
Furthermore, when I look at images of the work in progress, it's hard to tell from the outside what I've been tinkering with!? Cross-moving monoeye. Added detail to the inside of the shoulders. Added detail to the inside of the side and rear skirt. The chest part has been post-fitted to make it easier to paint. While using the regular hands, they can also be swapped for HDM. No, I made four arms and swapped them out starting from the elbows. The reason the colors in the images are different is because I had just switched to digital cameras at the time, and I was experimenting with different light sources.

1/144 MS-09RⅡ Rick Dom II | 八丸's Gunpla works