Here's a couple articles from CreativePro.com that describe many of features and options in Photoshop 7 paint engine and brushes palette.

http://www.creativepro.com/story/feature/16873.html

http://www.digitalwebcast.com/cgi-bin/getframeletter.cgi?/2002/03_mar/features/ps7closer2020313.htm

Several illustrations of what's possible and various settings to get these results.

tnx danny
useful indeed
cheers
heathrowe