My sister gave me “The Laws Guide to Drawing Birds” by John Muir Laws as a birthday present back in July. I haven’t read it cover to cover yet, but once in a while, I read two to four pages to learn interesting things like what bones and feather groups make up a bird wing and how the wings fold. Last week, after neglecting the book for a month or so, I thought it would be fun to learn a little about the different feather groups on a bird’s head and re-draw the diagram myself. I think the head belongs to a prototypical sparrow but it kind of resembles a Savannah Sparrow (because it has all the stripes). This is the Sibley version of a Savannah Sparrow head. Looking at the Laws and Sibley drawings now, I notice that I made a subtle error with the subauricular (or moustachial) stripe. It should be thinner near the beak. Also, before seeing the Sibley version, I didn’t clue in that the stripe is part of the auriculars, not below them.
You can see the original drawing with Google Books here (page 18). Also, John Muir Laws has a blog with many cool bird drawing tips, including this cool gif on how to draw a warbler (the gif is on this blog post). In the book, the steps are split in two (pencil sketch on page 11 and final painting on page 100).