the best way is using the 'infinity explorer' program that lets you see EVERY graphic and script used in the game http://infexp.sourceforge.net/
if you want to take screenshots, simply press the 'print screen' button on the right hand corner of your keyboard. The screenshots are stored in a folder inside the game directory, it should be C:\Programs\Black Isle\Icewind Dale II\Scrnshot by default. I hope it helps!
Going back to topic, I'd like to share with you all a fan art of mine, it's still work in progress, I hope you'll like it!
It's Diriel using Snakebite against some Aurielites. That spell does wonders ^_^