By Aditya Shukla - creator of the brain-based guitar method
The audience's emotions resonate with your face along with the music.
Your posture as a musician changes how you play your instrument and what others feel. It becomes a feedback loop.
Well executed sloppiness and random noise from how your hands touch the guitar create feel.
Small variations in a melody that repeats gives your listener a melodic journey.
Most people develop a fixed vibrato style, but feel emerges from varying your vibrato in a musical context.
Taps, harmonics, pauses, mutes, etc. that come and go quickly makes playing dynamic. Look at Tim Henson.
Practice and rehearsals are great, but your listener often realizes what's done in the moment. That makes your sound more interesting to listen to.