You're going to struggle to make that work at such small scale, without it looking a mess. Increasing the size of the camo pattern is also going to be a pain, as those abstract white and dark brown blobs might look a bit iffy.
Dark Brown - Dark flesh/scorched browns
Other Browns - Increase mix of bleached bone.
Greens - Snot green with a touch of bleached bone for the grass green, again adding more bleached bone for lighter shades.
3 colour paint job. Win.
Think about basing with a midtone and highlighting it before applying a camo scheme, as without any depth camo can look strange on cloaks.