This cup had a big brand sign of a company at the side. When I stumbled over some porcelain pens in black at a reduced price, I took them to try to cover the brand logo. This is why the swallow is rather a big one, the bird had to cover a broad space. A very fast little project :)
I have several cups with brand logos on them. Not that I like that but quite often I like the shape f the cup itself. This is sometimes even more important for me than the look. Now I may just repaint all of them!