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To make a guideline for placing the eyes, sketch a straight line from the top of the head down to the bottom of the chin. Press lightly since you'll erase this line later. Position each triangle so 1 point touches the middle of the bottom line. Make another point come close to the vertical guideline, but don't let the point touch it. Then, draw the final point up towards the temple and draw lines to connect each point. These triangles are the outlines for the eyes of Spiderman's mask. Draw over the bottom point of each triangle to make the bottom of the eyes curved. To exaggerate the top of the eyes, make each of the top corners point up toward the temple. If you prefer, make the top inner corner of the eye curved as well. Put your pencil on the vertical guideline between the eyes and draw over it again to darken it. Then, make a straight line that extends from the middle of the eyes up towards the top of the head at an angle. Keep drawing these straight lines around the head and leave space in between each. Use a ruler if you need help creating perfectly straight lines for the webbing. Start at the lines that are just above the eyes. Make small lines that curve down in the middle and connect with the straight lines on the ends. Do this up towards the head, making the curved lines larger to connect with the straight lines. Make the bottom webbing lines curve up instead of down since they're being drawn towards the center of Spiderman's face.

Summary:
Draw a vertical line through the head. Sketch 2 triangles that touch the guideline in the center of the head. Round the bottom point of each triangle and extend the top point towards the temple. Draw straight lines that radiate like a web between Spiderman's eyes. Make small curved lines in between each straight line to create the webbing.