Here is a recent work I did to test Lux with some Daz models. The purpose was not to reach photorealistic result but something approaching a painting.
Inspiration : Pornocrates by Félicien Rops
Modelling : Blender and Daz victoria 3 as base image for the model and some sculpting work within Blender
Rendering : LuxRender 0.6 RC5 Sampler = Lowdiscrepancy, Intergrator = path
Light : HDRI + Mesh light
Rendering time : about 1h15 in 1300x1800 on a core 2 quad 2.83Gh
Here is another version, not my prefered but it may be more appealing for some people