For this assignment we were expected to abstract Bilbao Guggenheim Musseum and we were only allowed to use one of the followings: parallel horizontal lines, parallel vertical lines and parallel angular lines. And also we were suppose to enlargen the image we had.
Before enlarging the image given, I found a ratio: 1,6. According to the result I found, I started drawing the image. I also practiced drawing parallel horizontal lines with different pencils in different pressures.
It is important to work clean, because you could smudge the drawings. Thus, you should cover the parts you finished with tracing paper. And one other thing we should pay attention here is the quality, weight and the sequence of the lines.