Keeping a Travel Sketchbook

Barbara's Portugal sketchbook class was so much inspiring that I decided to make a travel sketchbook from my trip to Denmark this August. Unfortunately I didn't have the time at the different places to sit down and do a whole watercolor sketch. Therefore I did short pencil sketches and refined them at home in my sketchbook.
My trip through Denmark with main stops.
I was fascinated by the carferry which was hanging underneath the railroad bridge (Rendsburg, Germany) and transported cars and people from one side to the other of the canal.
Ribe is the oldest town in Denmark with beautiful old houses, a huge Dome and a cute little harbour. I had to start with the fineliner first- there were too many details - and add the color afterwards.
Here I started with colored pencils and added watercolor - similar to Barbara but not brave enough to start with paint right away.
My pencil sketch and my watercolor sketch:
Four men watching the sea - I tried negative painting but it didn't satisfy me, but I like the house in Ringkoebing and the line drawing.
(Can't manage to turn the foto around)
The old church near Skagen buried by a shifting dune. Atmospheric perspective is not completely correct. (added text and fotos from a postcard)
Land's end near Grenen: North sea meets Baltic sea. People were transported with the "sandworm" to the point.
I got more confident with my pencil drawings - they are looser whereas my
watercolor sketches need to get looser. Aarhus has beautiful modern buildings.
Odense - the town where H. C. Andersen was born and where he wrote lots of his fairy tales. In the park of Odense they had a performance of one of his tales and many children and adults where listening.
The pencil sketch was no problem but when I started with the wc sketch I am puzzled because I am always wondering what to paint on first place and what on second and third. (sky first, then trees, roofs, walls and windows, floor and last people?) I tend to mess up my sketch. Maybe Barbara you can give me a tip? I love your loose painting style!! I am still far away!!