Don’t gets so carried away in the pursuit of technical excellence, that you start ignoring simple, tasteful playing. It’s fairly common, when you start to feel comfortable playing an instrument, to overplay. Even playing at 100% consistently is bad, you need to leave yourself someplace to go during the climax of your solo’s.
Also playing live, you have to pay attention to situations and surroundings. When improvising, try to make all your choices A or B. Fast or slow, mean or fancy, major or minor, high or low register. Never put yourself in the situation(live) of thinking “gee, there’s so many thing’s I could play here”.
Now style is a kind of vague thing, just like good music, everyone has their own idea of what style is. The easiest way to tell if you are developing your own style, is ask the question “who do I sound like”? If you find yourself borrowing from one particular player exclusively, then you are going to fall into the trap of being a copycat.
Everybody learns note for note passages, and this can do wonders for your technique, but music is a communication skill. If all you do is communicate someone elses message, then you are essentially performing the task of a tape recorder.
I’m not sure who said this but “being creative means NOT BEING AFRAID TO MAKE MISTAKES, being an Artist is KNOWING WHICH MISTAKES TO KEEP”. So when you make a mistake and it sounds ok, make a mental note of it. The more obscure your influences, the more unique your style will sound.
To me a big part of a Guitarist’s Style is the way they balance melody and dissonance. Try experimenting with noises, sound effects, if you can control a noise you can make it part of your sound. The only way to come up with new sounds is to try unorthodox techniques.
Mixing two or more styles of music together is an obvious way to sound different. The more different styles you can play competently, the more unique choices you’ll have, writing or playing. It’s definitely not a waste of time for a Rockabilly Guitarist to learn Celtic music or Klezmer music. Look at Paul Pigat, he has a degree in classical music. Or Roddy Radiation from the Specials, he started out playing Rockabilly and you can really hear it in his playing. Jeff Beck plays some mean Cliff Gallup lines and I’ll bet he bases part of his sound on those solos, whether it’s note for note or just the feel.
No matter how many notes you can play and how fast you can play them, if your granmother can’t recognize you when she hears you on the radio, what good is it?