Step 10: Darken the front part of the guides but make the lines a bit curvier and the tip a bit pointier.
Step 11: Use the sloping line on the left as a guide to draw the first part of the wing. Follow the path of the guide but make the line curve more and dip lower at the bottom. Add a shorter line at the top to give the edge of the stingray's wing extra thickness.
Step 12: Use the guides to draw the side and bottom of the wing but curve the lines more. The bottom of the stingray's wing should curve up higher than the guide and create a folded appearance.
Step 13: Use the triangular shape at the top as a guide to draw the stingray's other wing. Darken the basic path of the guides but curve the lines more for a more organic shape.
Step 14: Use the lines at the top as guides to draw the rest of the stingray's body. Add an extra line at the top for a ridge. On the left side, draw a curved line for a fin.