i think tuts aren't the way to go; learning is done by doing in GFX, like trying new styles. learning can be surprisingly rapid if you try.
for me, it went like this:
[IMG]http://i381.photobucke*****m/albums/oo259/darkstar9540/past%20sigs%20and%20avvies/halosig-1.png[/IMG]
(blows nuts)
to [IMG]http://i381.photobucke*****m/albums/oo259/darkstar9540/past%20sigs%20and%20avvies/halosigabstract.jpg[/IMG]
(i learned to blend)
to [IMG]http://i381.photobucke*****m/albums/oo259/darkstar9540/past%20sigs%20and%20avvies/halo2dualwieldred.png[/IMG]
(applied flow principles)
to this [IMG]http://i381.photobucke*****m/albums/oo259/darkstar9540/past%20sigs%20and%20avvies/halosigbest.png[/IMG]
(combined theories)
looking at other's work and progressive work helps a lot.
oh and edit: this progression happened in about 3 days.