Till the end of the line, drawing

I don’t know what drives me when I have done a little sketch like this one to fo further and further and further trying to reach that elusive goal, the end of the line, the moment the drawing is perfect.
So, I know I won’t let that small sketch rest quietly in a drawer but I will draw it again and again and again till I will be mad at me, because, the end of the line is not reachable.