I did a test corner with a file. Both sides got an angle around 45°. This is the result after gluing without any further fine work on the bricks.
It is surely not perfect but much better than the corners on my building from yesterday. With some further training it might become better and closer to Kurt's results.
Jens's brick work is outstanding but I am very sure I do not want to spend the time to do that. That is not my hobby world :o
I will use it as a test vehicle of various techniques to make brick walls. I need to do a clean cut (and sanding?) to join two walls flat and I need to cut strips of bricks to be glued on the wall.
This is a simple join. Both sides are carefully sanded (final touch with the fingernail). I did intentionally not respect the single brick stones. The slightly misalignment of the rows was not my intention. Need to do more practice but the technique looks sufficient for me.
Next did I try to continue the brick lines around the corner for flat pillars with a very small file. It did not work at all. My eyes and hand did not agree at all where a little trench has to be filed. The edge was simply ruined. That technique is beyond my capabilities.
Next is a flat pillar as the building from yesterday had three at the front. I did continue with the simple approach but made sure everything was done clean and neat. That is far away from Jens's models but at least it looks clean. I am not sure if the pillar would look better if it would consist of three elements with four 45° angeled edges in the foreground. May be I will try it at a building very in the foreground.