Tree - drawing exercise

Drawing exercise: tree (following this tutorial by creosfera). 
See final drawing here.

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A few months ago I took part in online course of drawing (for those interested a website here. At the moment (22nd February 2017) the course is archived, but I believe it will be re-open in nearest future). 
I'd never worked with pencil before, only digital media and with focus on cartoonish style, so you have a insight in, what I could call, baby-steps. Of course a loooong way to go for me, but IMO the course is giving great starting point and I recommend it to everyone that would like to improve their skills).
Here're other exercises for course:

Exercise one: An apple.
Exercise two: A landscape.
Exercise three (unfortunately quality of the scan is too poor to upload it).
Exercise four: A rat.
Final work: Squirrel.

Now I'm coming back on drawing track with a decision to spend an hour a day with pencil in my hand.
1. 22 Feb 2017: A rabbit.
2. 2 Mar 2017: A hornet.
3. 15 Mar 2017: Still life.
4. 22 Mar 2017: Scaled quail.
5. Tree - drawing exercise (above).
6. 24 Mar 2017: A tree - practice.
7. 25 Mar 2017: A tree - practice II.
8. 6 Apr 2017: A turtle.
9. 26 Apr 2017: A house.
10. 1 May 2017: Foggy mountains.