The novels take longer to write than the picture book texts, and they do take a different sort of concentration. However, a very short, simple story that works well is just as exciting to me as any longer and more complex book.
It is a good idea to know which publishers publish which stories. For example, there is no sense in sending a picture book text to a publisher who does not publish picture books.
It can certainly happen that characters in more sophisticated stories can 'take over' as they develop and change the author's original ideas. Well, it certainly happens to me at times.
I once knew a house rather like The Land of Smiles - an old house occupied by a varied collection of young people, mainly students. However none of these people were true models for the characters in the book, though their way of life may have been.
I had to wait for a long time before I could support myself with writing. However, being a writer is what I have most wanted to be, from the time I was a child.
I am really chained to my computer these days so I work in my bedroom, which is a room I have worked in for years and years. It is just as much an office as a bedroom, and during the day, my bed is rather like an extension of my desk.