I really wish they would do portraits
But I suppose in depth customization would do
Why not both though
Portraits were good when the character was essentially a sprite, but my recollection of BG1/2 is that they were mostly portraits of characters you met - very awkward meeting yourself!
I quite liked the way DA:O allowed you to do a "portrait picture" of your created character, choosing angle of view, facial posture, background colour etc. I thought that was a nice touch.
