By placing lines at various distances from one another, the image gets more structure and gives the illusion of a body. A variation in width gives more dimension to the image and illustrates a sense of realism.
Chinese Stealth Tech- many think China borrowed fighter technology. I also think it would be foolish not to use proven ideas. Plus if your designs can be taken the only main advantages are strategy and training. This where the majors have the edge.
Chengdu ( Chinese cutting edge stealth technology ) Well not perfected to standards of American stealth engine heat masking technology, but certainly getting there as radar semi invisible design wise !