Rendertime around 14 min on Dual GTX780's. Max plugin. PMC @ around 3000 samples.
First the night shot:

Now the day shots:





All comments/crits welcome, I'm a new Octane user (1 week) and looking for ways to improve!

Wise words from someOne who's doing archViz for living.mbetke wrote:
So you you could d oa quick image search vor "desert villa" on Flickr or Google. You can concentrate on a certain aspect of you project like doing a proper wall material which looks like on you photo reference. If you get a feeling for it you can proceed to your next step like mimic the same lighting as seen on you refernce image.
This will improve you overall skills step by step and you can migrate this knowledge to other projects with a long term benefit.