I'm a beginner artist and I want to draw like pic related, what techniques should I practice or what books should I buy?
It wouldn't require any special study, just the usual fundamentals. Check the sticky and the beginners thread.
And this painting is done with soft pastels. Though I wouldn't recommend leaping into colour of any kind before getting very comfortable with basic drawing fundamentals. Working with charcoal (pic related) might be a good in-between medium to work with as a beginner, since it's physically similar to pastels (but a shitload cheaper) and will allow you to get familiar with the fundamentals before complicating things with colour.