Quote - I remember one my art teacher asked us to do once - and that was to hang a shirt on the back of a chair and sketch it.  The way the folds of the shirt work with the light was a very useful study, and getting the precision of a chair's legs / perspective is also a useful challenge.  Give it a go and see how you do.  

Also - take aaaages over sketching - be a perfectionist.  I have a sketch (digital) of Scarlet Johanson in my back-catalogue on RR and i can remember that it took at least 8 hours of (essentially) trial and error:

http://www.renderosity.com/mod/gallery/index.php?image_id=1756079&user_id=409068&page=15&member&np

Then it gives you a "i can do that" attitude and then nothing is impossible...

Rich

Thank you for the encouragment.

The sketch that you did on the link that you gave is amazing.

Much more practicing for me to do to improve.

God Bless.