Imagine drawing a picture with a pencil on a piece of paper. Each time you move the pencil, you make a line on the paper. Now imagine you drew 441 lines on the paper to make a big picture. That's what "441 lines" means - it is the number of lines used to make an image or drawing.
For example, if you looked at a picture of a tree that was made up of 441 lines, it would mean that the artist drew 441 straight or curved lines with a pencil to create the image of a tree.
This number is important because it can give you an idea of how complex or detailed a drawing is. The more lines there are, the more time and effort it takes to create the image. So, if you see a drawing with 441 lines, you know that the artist spent a lot of time and energy on it.