You can change the matcap option, I used the MatCap Library by westlaketea.
Instructions: In Advanced Editing click on Textures then click the folder icon and select you preference matcap. Once you can see your image in Penumbra click on "Save as TEX" and overwrite the file "matcap_mc.tex" in texture/matcap/chara/equipment/e6072/texture/matcap_mc.tex
If you find out any problem pls let me know so I can try to fix it.
• TOS: Edits/upscales are permited. Don't sell any edit/upscale pls, this is a free mod so any modification to this mod needs to be free too. Don't claim as your own.