Edward Burne Jones, Drawing of Wings - no tutorial - from http://sweetpeapath.tumblr.com/post/24202471167/edward-burne-jones-drawing-of-wings-n-d-via
Lovely vintage birds...
I'd love to try any of them, really.
Skylark Geometric illustration by tinykiwiprints
Nice use of color and especially shading on the bird. I also like the use of detail in the center of the bird.