Normally the work you do on tutorials can be placed into you DemoReel/Portfolio.
There are no issues with this, but you should be aware that you should only put your best work into a portfolio, and any tutorials you do should be stated as such...
By that I mean you would mark each image as either:
Personal Project
Challenge Project
Tutorial Work
Course Work
etc... etc... etc...
Your Portfolio is what would land you a job... With that in mind it should shine out...
Chris (formerly R@nSiD)
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When the power of love overcomes the love of power the world will truely know peace - Jimmy Hendrix
Winner SM VFX Challenge 1
3rd Place SM SteamPunk Challenge (May 2007)