Soo I've been doing more digital drawing again lately, and have managed to improve my shading with lots of practice on Sai.... so now I'm trying to move onto backgrounds!

I want to improve my skill at them (and make them not look like they were drawn by a two year old) so I was wondering if anyone who is familiar with Sai has any advice for me? What tools and brushes do you use? Layer types? Opacity? etc etc. I've tried messing around with different things myself and tried googling some tutorials, but I havent found anything so far that has been of any help to me!

Also, how do you download new brushes for Sai? I havent managed to successfully do so!

Many thanks for any tips and advice! They would help a lot!