This recipe is mainly here as a reminder to myself; it uses several paint ranges to achieve an effect I'm sure you can manage more simply! I chose the red-orange desert scheme to complement the warm green tones of Salamanders Space Marines.
After priming, basecoat the entire base with Kalahari Orange (apologies, forgot to take a photo of this step, but I'm sure you'll manage!)
Apply a heavy drybrush of Ryza Rust or similar bright orange
Apply a lighter drybrush of Sunny Skin Tone , focusing on the higher areas
Add some shadows around larger bumps and in recesses with Agrax Earthshade or any brown wash
Wash the entire base with a 1:1 mix of Fuegan Orange and Orange to bring the previous steps together and intensify the orange colour
With a battered old brush, apply some spots of orange pigment randomly around the base. (I use cheap pastels I've scraped with a knife to make my own basing pigments.)
Finally, to make Miniac happy, paint the base rim with Black . I like the Scale 75 for this as it has a very matte finish.