Hey Bobby, I am not in any position to critique sketches - as my level of drawing is in the "stick figure" category. But I think you are on to something, and keep it up! I have done a little bit of bird carving and I have gained such an appreciation for artisitic endevors. I think it can only help in your abilitiy to understand the subtleties of bird identification. All that said - I think the drawing is great - the impression of "Great-creasted flycatcher" is dead on, no mistaking that. I really like the detail in the feather grouping also. I think it is awsome Bobby, like I said keep it up! - Before you know it, it will be "Audubobs guide to NA birds".
Take care dude - dave