I created this HGUC ZZ Gundam to resemble the Ver.Ka version! (I really wanted the MG version, but it's not available...)
Regarding the face, I felt that the side ducts were angled inward in the original kit, so I cut them with a coping saw! I re-glued them facing forward by about 0.2-0.3mm, and also slightly shaved down the sides of the ducts to make them thinner.

The shoulder armor was modified in parts using plastic sheets and runners. I also added detail to the backpack using plastic sheets.

HGUC MSZ-010 ZZ GUNDAM | snowman91's Gunpla works