Show close-up photos of spiders and webs to show the hairy textures on them. Try not to have students draw from photos since the lighting and other factors are difficult to portray.
Demonstrate how to draw hairs to create a shape rather than draw a shape and fill it in with hairs. Ask the students if they have seen you draw any lines. Then ask them if they have seen you draw many hairs. Students will then try this technique themselves.
Using arrows, draw and point out the directions that the hairs are drawn in, on the illustration. Help the students to practice their observation skills. Point out the direction they have drawn their hairs in to see if it is the same.
Give the students 2 work periods to complete their drawings. If they take a fresh look at their drawing they may see the hair shapes and directions easier the next time.
Display the spider drawings even if they are not complete so that the efforts and time taken to complete the drawings are appreciated. Students will likely find this a slow and hard skill to try the first time. Students will also be pleased with a drawing that is realistic.