First I glued some reasonable-sized chunks of slate to the base, followed by sand.
Photo blocked by adult filter:
"Sand and slate added to base"
Then it all gets a coat of neat brown ink.
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"Inked base"
When the ink is dry, the sand gets a drybrush of Bestial Brown, then Vomit Brown, and finally Bleached Bone. The chunks of slate are painted Chaos Black, then highlighted with Graveyard Earth, then Bleached Bone.
To finish, I sprayed the model in 'Ardcoat Gloss Varnish, then a couple of coats of Testors Dullcote to take off the shine.
This miniature, I have to say, turned out better than expected. Although it also took way longer than I bargained for. 
Editor in Chief Bill 
got a good deal with this one!
Photo blocked by adult filter:
"Bugharoth finished"
Photo blocked by adult filter:
"Bugharoth finished"
To get yourself a Bugharoth painted by me would cost £45.00 GBP in Brit money. Make sure you go to pro-painted-miniatures.com to check out some of my other stuff!