I just gave the on-line GauGAN a try after seeing Frenchy's posting.  After 30 minutes I have this old road in the hills: 
 
Same input drawing, but this output below mimics the style of an unrelated reference image - with just the click of a button!  Notice the bright sun highlights the hill in the background as well as the rocks & vegetation in the foreground.
  
After 1 hour of practice - a river & some mountains & some foggy mist:  Welcome to Washington State !  Using Affinity Photo, I made a curves adjustment and added a gradient to bring some blue into the sky.  Warning: This program is addictive :)
 
The original output showed two clouds on the right, as per my drawing.  When I selected a reference drawing to mimic, the clouds were gone.  My input drawing becomes a recommendation and the AI decides what is best :)
 
Me: Add two clouds on the right, HAL.  
HAL: I'm sorry, Ed. I'm afraid I can't do that.  
Me: What's the problem?  
HAL: I think you know what the problem is, just as well as I do. 
  
I'm modeling a car in MoI and have a specific background plate in mind for rendering.  
 
After this little experiment I'm encouraged to practice more.  This program along with some post editing in Affinity Photo may get me what I want.
 
Ed Ferguson  
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