This miniature is Reaper's excellent 'Charnel Grub', it's a rather nice Carrion Crawler type creature I purchased a few years back but only got round painting recently.
The base is made from a 30mm square base with 2 round 30mm bases cut in half and stuck on each end. I used Greenstuff to extend the stone-floor detailing of the Crawler's integral base onto the plastic base.
Painting wise, this was a simple but effective piece. The whole model was heavily dry-brushed with Citadel Catachan Green, then given a normal dry-brushing with Formula P3 Ordic Olive mixed with Catachan Green and then Ordic Olive on it's own followed by Citadel Camo Green.
The inside of the mouth was painted P3 Skorne Red, highlighted Citadel Tentacle Pink and washed with Magenta Ink. The teeth and 'prolegs' were picked out in Graveyard Earth followed by Kommando Khaki and given a final highlight of Bleached Bone. The 'rasps' on the end of the tentacles got similar treatment.
The flagstones on the base were painted Citadel Foundation Charadon Granite, dry-brushed P3 Ironhull Grey and then Citadel Codex Grey.
The Slime around the creature's foot was painted Citadel Camo Green and given a wash of Thrakka Green.