First, draw the guide lines for the wing bones. The largest circles is the shoulder blade.
Next, draw additional guide lines for the coverts. Notice how the primary coverts (near the outer edge of the wing) are fanned out in different directions, as indicated by the arrows.
Now, fill in the coverts. The primary and secondary coverts (the two different curves you just drew) should be distinct from each other. Make sure the primary coverts are fanned out!
Now it's time to draw the primary and secondary flight feathers. Draw the guide lines, and make them separate by drawing a straight line between the two curves.
Again, notice how the primaries fan out, as shown by the arrows.
Fill in the primaries and secondaries. Primaries are more pointed, while secondaries are rounded at the end. Be careful to make the feathers overlap correctly!
Now it's time to draw the tertials! Draw a triangular shape at the base of the wing, and erase the stuff inside the triangle.
Fill in the triangle with overlapping feathers. They should be crisscrossed slightly.
Now, it is OK to remove the guide lines! But we're not finished yet...
We must still draw the ever-important alula, which is a "thumb" feather on the tip of the wing bone. It can be as large or as small as you like, or even tucked in under the coverts and primaries. After you've drawn the alula, you're done!
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