The area is blocked out and some detail has been added. I've been teaching myself Mudbox recently, which has only been used to Normal-Map the Archway bricks at this point, but I'll be Normal-mapping the rest as I go along. The real difficulty will be in the texturing, getting the right balance of detail and style. The lighting is also going to take some thought.
Edit: Still texturing:
The Original Concept Piece:
I'll continue to work on this and post updates. I'm not sure how exact I'll be keeping to the reference yet, but I'm hoping to not stray too far. I'm also in the process of more researching and soon-to-be drafting my Dissertation.