Thanks for the comments people
Have done this little step by step guide for this great Ork. (most of it is a standard Eavy Metal paint guide)
1. Base coat knarloc green (thin layers)
2. Wash with dark flesh than scorch brown
3. Build up midtones with knarloc green
4. Start with highlights with 2:1 mix of knarloc green & vomit brown
5. Add bleach bone to that mix
6. Add vallejo ivory as extreme highlights (also added teeth, scab red for lips & eyes)
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