Good advise, bamber.
... Inside and outside of the grid
Build on the inside of the grid with a 4m wall.then on the outside put in a 1m wall around the base and change the colour it now looks like a facia board and is quite nice. effect Changing colour of a facia bored was almost another tip ...
To this one, I have an addition:
It's not even neccesary to leave the grid - unless, of course, you want the salient.
One beautiful detail of PZ/PC's building system is, that the wall pieces are not completely symetric, but a tiny bit off-center.
The result is that we can turn them by 180° and they will show/hide in other walls.
The arcs can be filled with different wall types or, as in your example, a certain part of a wall can be "colored" differently without otherwise visible salient.
--
But, yea, the main tips were already posted multiple times:
1) Get inspirations from looking at pictures! Lots of different ones and then specific ones for the actual building project. The greatest naturalistic painters didn't create their pictures just out of their imagination. They sat in the nature and painted what they saw or had barely dressed models sit in front of them.
It's important though to learn to recognize details and not just "gaze" at something superficially.
Analyze, what you are seeing! Point out to yourself, what makes this building different to other building styles, what defines its character.
If you
really want to dive into it, try to draw it. That's what we did in our anatomy courses when I studied biology. There is no better way to learn about an object. What are the size relations? What are the angles? What the little details that add to the overall picture? But again, this is probably taking things too far ...
2) Familiarize with the available pieces. Go to the sandbox, filter for a theme so you get a feeling for it and are able to finde the pieces more easily later and
just place them down.
Look at them. Try to imagine what else you could do with them. Even if no other use is apparent, your brain needs to know stuff in order to be able to associate with it later, when you need it.