I'm using these....
Nice links...
Place to find new portraits
1) https://www.google.com/search?q=portraits&es_sm=122&biw=2133&bih=1194&tbm=isch&source=lnt&tbs=isz:ex,iszw:210,iszh:330#imgdii=_&imgrc=HMbESPyxG34-QM%253A%3B0WMzbps9Qc05_M%3Bhttp%253A%252F%252Fcdn.vanillaforums.com%252Fbaldursgate.vanillaforums.com%252FFileUpload%252F5c%252Fb6d7757fe2c3023cb78715e8208de8.bmp%3Bhttp%253A%252F%252Fforum.baldursgate.com%252Fdiscussion%252F5339%252Falternate-npc-and-pc-portraits-just-because-p%252Fp52%3B210%3B330
Place to resize images
2) http://www.webresizer.com/resizer/
Place change file type
3) http://change-images.com/convert-images.htm