These are some of the sketches that I referred to, to sculpt the crouching griffin chick.[link]
I did these to figure out what griffin my chicks would look like . I based their faces on chicken, and peacock chicks,( I used both kinds as live models) not an eagle chick.
Most of my "working " drawings are very sloppy, and not fit to show anyone, but this one looks ok after I cleaned it up a bit in photoshop.