I like this alot.I really like the silhouette, its very strong and visually interesting. Really nice choice of reference picture. I think you have done some good work here.
I wouldn't worry about 100% accuracy. I tell my students to aim for about 70%. There are minor proportional issues,so perhaps make a sticky note and work on that next time.
My only other tips would be to push your shadows and blacks and spend some time to study gesture and introduce that to your drawing style.
The bird is looking a little stiff. If you look at the photo, there is a certain flow to it that your study is missing.
You could also consider putting more details around the focal point, in this case the head, and less details as you move away. It will make your sketch stronger. Unity through variety.
Other than that, keep drawing. Aim for 3 hours a day minimum. Keep your drawings to about 20-30 mins a piece and keep cranking them out.
Throw in drawings that are from your imagination based on what you learned from your studies. Force your brain to learn rather than just copying all the time. If that's all you do, you will just be mindless in your drawing and never really learn as the human brain loves lazy. You need to keep forcing it. The best way to learn is by doing something the hardest way possible. The more you fail and make mistakes, the better you get.
Finally, I would get yourself some cheap A4 copy paper and use that to draw. I find that with expensive pads, your more likely to worry about messing up and therefore not enjoy drawing as much as you worry about the cost of that moleskin your working on. I go through nearly 500 A4 a month here with gestures and doodles mainly. I could never output the same work on expensive sketchpads. Your doing very well so keep at it.