I always do my very best to go back and edit my tutorials when an artist leaves a company, ect. However, I'm not perfect so it's possible that I may miss some from time to time. If you can't find an artist at the site I'm licensed to then please check the artists site for more licensing info.
Also, MyTagArt officially closed November 1, 2011. I have 206 tuts featuring artists from this particular company. I will be updating these as soon as possible but for now please check the artists site for more licensing info.
Thank you for your patience.