i dont consider praciticing guitar *practice*
i do it kuz its fun, i sit dwon, train myself, but i dont think its a practice, its an obssesive enjoyment
there are some things u can try if u wana *sound* like a virtuoso
-sweep picking arpegios up and down (but u gotta know ur arpegio chord progresssion before u improvise sweeping
-alternate picking (look at yngwie, do i need to say more?)
-tapping, one of my favorite stuff to do, wil make u sound hella fast n good, melodic as well, depends on what mode u wanna tap on, harmnoic minor sounds the best to me, lydian, if u wana sound liek vai
-hamer on pull off, including the open note on open string, for ex: 0h4h7
0h5h7, 0h5h7h9, ect... those were majors by the way
-also, try to come up wiht ur own lick, which u are comfortable with.
for ex, Vai's for the love of god solo, his first phrase is ona a very comfortable fingering, and he shreds it
-repreat ur phrases