Working here and there might be nice, but to get a portfolio done, I had to get more detailed on what I want to do. I decided for school books, since it's a way to use a rather simple and fast style of drawing, which isnt too far away from how I work. And I really dislike many of the school book illustrations here in Germany. To me it looks all too boring and I'm confident that a schoolbook in my style would be more interesting, since the characters are more loveable.
First shot: It's roughly office themed I'm ok with the characters, but the outlines could still be improved to be a little more sketchy, to make it look more dynamic.