Pots of paint to paint a shed.

Well normally painting a shed would mean I  would be in the Garden and a pot of B&Q's finest green. It would be Summer and a beer in hand. Here ,on the other hand , yes , a beer in hand but indoors , whilst Britians longest downpour in memory continues unabated. Time to ponder about how do I try and recreate the look of the stone finish to this shed?
    Many years ago I managed to persuade the family that a summer holiday in North Devon would be a good idea. A certain railway station was visited and a close photograph of the stone wall construction at Woody Bay was taken ( the trip also enabled me to study Barnstaple Town by the way).

 I've started the painting by an under cost of Halfords plastic grey Primer. After this a quick wash with acrylic white ,which was quickly then rubbed off leaving only white in the mortar coarse. Using various acrylics I've tried to copy the colours of the walling. Surprising to me is the high level of reds and Browns. I started the painting on the unseen side of the shed ( North) in case of drastic alterations.
Now , to be honest the jury is out on the finish I've managed and I'm looking over what has been achieved . To me it still looks too bright and fussy?  Perhaps more subtle use of the acrylics is in order and also a weathering afterwards.....let's see what more beer and pondering will deliver.