I used to doodle things like these in notebooks.  One day, I decided to start painting them on a larger scale.  Several have sold.  People are always fascinated by the fact that I sew embroidery string through the paintings.  I am now in the process of making smaller scale ones, but I will also do some larger ones in the future.  I have a few in progress.  None of the designs are planned.  I make them up as I go along.