In the Guitar Skills section of the profile does it have to be original or can do you parts/riffs of songs. For example for tremolo picking can I do that part of Eruption or does it have to be an original made up by me?
As long as you say where the lick/riff is from, I can't see there being a problem.
Afaik when it comes to this you can put up whatever you want, so long as it is YOU playing it. For example, you could put up a cover of you playing Smells like Teen Spirit up in your Mp3's but not the one with nirvana playing. I assume the same applies to the skills section. As long as the skill is you playing and not a recording of Eruption, then you are ok.