Expression is the key here. Pay attention to vibratos, bends and rhythm as well. Also be careful with the ''pre-bends'' here.
In a pre-bend, you bend the string before you pick it.
If you listen to the great lead styles of Jimmy Page, Otis Rush, Mike Bloomfield, George Harrison, Eric Clapton and many others, you'll see how this has always been an integral part of string bending, and in a way, represents the pure "art" of the bend as opposed to the "act"!
As you continue to refine your approach to this style, you will undoubtedly be training your ear as well, and the knowledge of just how far to bend will start to become second nature to you. Enjoy!
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By Spyros Georgantas. Feel free to connect me via Facebook or Instagram if you have any questions or comments.