Getting started

I can model and can make basic materials/textures but I need help improving.

What are some good books/videos on beginning.

I use maya, zbrush and blender.

would you recommend any of these books:
http://www.amazon.co.uk/exec/obidos…2/3drendercomA/
http://www.amazon.co.uk/Digital-Tex…/ref=pd_sim_b_2

Also, how do you know the scalea texture should be?

Thank you