Wizards of The Coast has kept its D&D 3.5 Archive online, HERE. My personal favourite set of resources are the Art Galleries from the various books, showing a good sample of the artists who worked on the line.
There are also a huge selection of PC Portraits for your perusal, most of which make great NPCs, Hirelings, and inspiration as well.
Here's my favourites!
Clearly, this one comes from the "Let's Trace A Fashion Magazine" School.
This chick exudes a sense of confidence and kick-ass-ness that you just can't beat in a lady adventurer.
Eberron's Changelings were an interesting addition to a cool setting. The artwork simply made them all the more interesting to me.
This guy could be a villain, a hero, or just another town guard - the helm could go either way. Even better - he's a masked vigilante! The Helm could go either way...