Changing heroes portraits in Blade of Destiny

[Protoss]

Hi.
I've started playing Blade of Destiny (retro version). Generating characters took me a lot of time, as I tried to get the best possible attributes for each one, so I didn't pay too much attention to their faces. I thought I could change their looks afterwards. But it looks like I can't.

Is there a way to change their faces? Maybe with some editor or smt?