I wasn't 100% sure how to approach the skin of my Kroot, but also wanted some variation in skin tone for these boys. So, I decided to just wing it and have a play. Some of these methods may not be the most efficient, but if you wanted to replicate the results, here is what I did...

Yellow-Green Kroot Skin

1. Basecoat Nurgling Green .
2. Wash with Plaguebearer Flesh , thinned with an equal amount of Contrast Medium .
3. Go over all the skin again, this time with Reikland Fleshshade heavily thinned with Lahmian Medium . I am using the old (pre-contrast) formulation so did this with a 1:4 mix.
4. Some of the recesses still needed darkening, so I worked some Darkoath Flesh on my wet palette and shaded with a fine brush.
5. Reestablish Nurgling Green with general highlights, where you think it is necessary.
6. Mix some Nurgling Green 1:1 with Pallid Wych Flesh and selectively highlight within the previous stages highlights. I also like to pick out scars with this colour.
7. Finish off the skin with specular highlights of pure Pallid Wych Flesh . I also add dots of this colour to raised texture on scars.

For this Kroot Hound, I switched things up by replacing Nurgling Green with Ionrach Skin . This gave a slightly different result.

You could even introduce other colours into the contrast mix. My Bow-Hunter uses Ionrach Skin again, but for the wash I used a 3:1 mix of Plaguebearer Flesh and Guilliman Flesh for some extra warmth. I did keep the mix nice and thin still, mixing in as much Contrast Medium as paint.

On my Cold-Blood I used Ogryn Camo , not Nurgling Green . This made quite the difference, making the skin much more yellow.

Green Kroot Skin

1. Basecoat Nurgling Green .
2. Wash with 1 part Plaguebearer Flesh , 1 part Ork Flesh , 1 part Darkoath Flesh and thinned with 5 parts Contrast Medium .
3. Wash the skin with a 1:1 mix of Reikland Fleshshade and Lahmian Medium .
4. Reestablish Nurgling Green with general highlights, where you think it is necessary.
5. Mix some Nurgling Green 1:1 with Pallid Wych Flesh and selectively highlight within the previous stages highlights. I also like to pick out scars with this colour.
6. Finish off the skin with specular highlights of pure Pallid Wych Flesh . I also add dots of this colour to raised texture on scars.

With subtle variation in mind again, I painted this Cut-Skin with Ionrach Skin and not Nurgling Green . All the other paints and steps remained the same though.

Tan Belly

1. Basecoat with Ushabti Bone .
2. Wash the belly with a mix of Darkoath Flesh , Wyldwood and Contrast Medium .
3. Glaze and stipple a large highlight with Zandri Dust .
4. Glaze and stipple a highlight with Ushabti Bone .
5. Glaze and stipple a large highlight with Wraithbone .

Dark Leather

1. Basecoat with a mix of Abaddon Black and Rhinox Hide .
2. Recess shade with Nuln Oil .
3. Glaze large highlights with pure Rhinox Hide .
4. Add chunky highlights of Rhinox Hide mixed with Gorthor Brown .
5. Add fine highlights with pure Gorthor Brown .
6. Add selective highlights with Baneblade Brown .
7. Add a little white or Wraithbone to the Baneblade Brown and add specular highlights where needed.

Warm Leather

1. Basecoat with Mournfang Brown .
2. Wash with Agrax Earthshade .
3. Add chunky highlights with Skrag Brown .
4. Add fine highlights with Deathclaw Brown .
5. Mix a little Wraithbone into the Deathclaw Brown and slectively highlight eges.
6. Add specular highlights of Wraithbone where needed.

Tan Leather

1. Basecoat with Steel Legion Drab .
2. Wash with Agrax Earthshade .
3. Mix Steel Legion Drab and Tallarn Sand 1:1 and use this mix to glaze general highlights.
4. Now mix some Karak Stone into the mix above, in roughly the same quantity as the other two colours. Use this paint to add chunky highlights.
5. With pure Karak Stone , add fine highlights.
6. Now mix in a little Wraithbone and selectively highlight the leather.
7. Finally, add specular highlights of Wraithbone , where needed.

Beaks

1. Basecoat with Skavenblight Dinge .
2. Chunky highlight of Stormvermin Fur .
3. Mix some Ushabti Bone into the Stormvermin Fur and add fine edge highlights.
4. Now mix in some Wraithbone and selectively highlight edges.
5. Finally, add specular highlights of pure Wraithbone .

Quills

1. Basecoat with Skrag Brown .
2. Wash with Wyldwood .
3. Drybrush with Skrag Brown , getting heavier handed towards the tips.
4. Glaze exposed tips with a mix of Skrag Brown and Ushabti Bone .
5. Highlight the very tips with Ushabti Bone .
6. Add specular highlights of Wraithbone to the end of the quills.