Here is an explanation for using custom portraits.
Step 1. Make sure all the portraits are in BMP format. Sizes are for the large port 110W x 170H, small 38W x 60H.
Step 2. Open up the Icewind Dale program folder. This would be found in C:\Program Files\Black Isle\Icewind Dale. Right click in the window and select new--> folder , and name it Portraits.
Step 3. Place any portraits you have into this folder. Also a consideration needs to be made how you name the portraits. I have found naming them fem001L.bmp , fem001s.bmp, male001L.bmp, male001s.bmp. works the best.
Step 4. Start the game and enjoy your new custom portraits.
For more hints and tips take a look at my new webpage
http://www.iwdbg.cjb.net/