Drag and drop the head textures in:

Grand Theft Auto V\mods\update\x64\dlcpacks\mppatchesng\dlc.rpf\x64\models\cdimages\mppatches.rpf\mp_m_freemode_01

Drag and drop the body textures in: 

Grand Theft Auto V\mods\update\x64\dlcpacks\patchday4ng\dlc.rpf\x64\models\ped_mp_overlay_txds.rpf\