Thanks all - I was quite pleased with them.
The secret is not really in the painting though. They're all really great, characterful figures, and I went to some lengths to get my hands on at least three of them, kindly assisted by the generosity of fellow LAFers Admiral Benbow and Aircav.
With figures this good, the painting is an absolute pleasure, and seems to just flow from the tip of the brush

What is the backdrop building?
It's a Victorian warehouse / factory handmade by TM Terrain, which I borrowed from Malamute's extensive collection of Victorian buildings (he has a whole town you know

)