The tiny human silhouette in the top right corner is a brush by ~s3vendays.
DO NOT COPY, EDIT, OR REDISTRIBUTE THIS IMAGE IN ANY WAY, IN WHOLE OR IN PART. This ref sheet is for the exclusive use of *SilkenWinds, and you may NOT use this character or this image for ANY reason.
I don't have any such tutorials, myself, but there are a few around dA that you could look at. Unfortunately, most of the wing tutorials are pretty awful. Here's the best one I found in about ten minutes of looking: [link] It's pretty good but it doesn't talk about ptagiums at all. But it's a good starting point.
Read this tutorial and then look at a million pictures of bird wings until things start to make sense.
Read this tutorial and then look at a million pictures of bird wings until things start to make sense.