A lists of teachers from my gold-mining the internet :
gold - Feng Zhu website
fengzhudesign.blogspot.ca , the best of the best. Make sure you checkout his design cinemas 1-50
silver - Paul foxton website
www.learning-to-see.co.uk/ , he is an artist going back to drawing / painting thru self taught route . not only he can provide you with road maps , but he have two very helpful links
www.thedictionaryofhumanform.c… free to download book
www.learning-to-see.co.uk/comp… .
silver-sycra yasin website
www.sycra.net jason seiler ,blog
jasonseilerillustration.blogsp…bronze - On youtube there are -Myron Barnstone
- Daarken
-Ctrlpainter
-Digitalbobert
these plus Conceptart.org will keep you busy for months.
There are much more valuable information out there , but this is a short lists and my own two cents