The above drawing should have been a "rene" type of Urban sketch: grey Noodlers ink lines and shades of watercolour.
But it went wrong, in the end the painting looked like s***.
So I decided to use it for experimenting.
I added layers of gouache, wetting them, drying it with a hair-dryer, torturing the paint with bristle brushes and old credit cards. This is the result: a bit 60s advertisement look.