Good start, sono!
For the rendering settings i turn the main filtering system to Gaussian rather than blackman-harris, so i get no jaggies. Render path is Hybrid, so that the CPU uses all features including proper caustics, volumetrics and any feature not supported by OpenCL, but at the same time the GPU chips in with some heavy lifting work on the calculation of rays (apparently), utilizes about 10-20% GPU but still a nice speedup.
I heard, that Luxrender can use both, CPU and GPU, at the same time. I sometimes wish, we could have that for Cycles. But while Cycles can use both, its either CPU or GPU at the same time, what you are surely aware of.
I like the brighter scene and the sun light in your latest render. Some suggestions for now would be to add some kind of support to the board. There is something like a visible seam on the big amphora. Maybe the texture is repeating? Hard to say anything regarding the materials at this stage. The render is a bit too grainy. But you should keep working on the ceramic shaders. And the shadows could be stronger.
I like the realism of the new wall in the background