Way back in 1981(or 2), the band I played in video taped a show we did at a high school. When I watched it, I cringed on how not only my vibrato sounded but the way it looked
I immediately went out and looked for a video of a live band so I could watch over and over again a decent guitarist. I wound up renting a REO Speedwagon video. Gary Richrath's vibrato was so nice (I wasn't an REO fan). I would watch that video and sit in front of a mirror trying to copy how it looked for hours at a time.
Later I would listen and watch Steve Lukather (videos).
I really love Lukather, Lynch, Malmsteen vibrato. I really like Ace Frehley from Alive 1 as well.
I think anyone who can play for ten seconds and I instantly know it's them, has it in spades and it's usually because of their vibrato styles.
I'm more of a fan of wide melodic sounding vibrato. I am not a fan of quick spastic vibrato...just not my thing.
I probably worked on my vibrato more than anything else, I guess that's why my note choices usually suck..lol.
Mark